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Caltech Authors (169.800 recursos)

Repository of works by Caltech published authors.

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Mostrando recursos 121 - 140 de 281

  1. PTF11iqb: cool supergiant mass-loss that bridges the gap between Type IIn and normal supernovae

    Smith, Nathan; Mauerhan, Jon C.; Cenko, S. Bradley; Kasliwal, Mansi M.; Silverman, Jeffrey M.; Filippenko, Alexei V.; Gal-Yam, Avishay; Clubb, Kelsey I.; Graham, Melissa L.; Leonard, Douglas C.; Horst, J. Chuck; Williams, G. Grant; Andrews, Jennifer E.; Kulkarni, Shrinivas R.; Nugent, Peter; Sullivan, Mark; Maguire, Kate; Xu, Dong; Ben-Ami, Sagi
    The supernova (SN) PTF11iqb was initially classified as a Type IIn event caught very early after explosion. It showed narrow Wolf–Rayet (WR) spectral features on day 2 (as in SN 1998S and SN 2013cu), but the narrow emission weakened quickly and the spectrum morphed to resemble Types II-L and II-P. At late times, Hα exhibited a complex, multipeaked profile reminiscent of SN 1998S. In terms of spectroscopic evolution, we find that PTF11iqb was a near twin of SN 1998S, although with somewhat weaker interaction with circumstellar material (CSM) at early times, and stronger interaction at late times. We interpret the...

  2. iPTF14yb: The First Discovery of a Gamma-Ray Burst Afterglow Independent of a High-energy Trigger

    Cenko, S. Bradley; Perley, Daniel A.; Cao, Yi; Kulkarni, S. R.; Laher, Russ; Kasliwal, M. M.
    We report here the discovery by the Intermediate Palomar Transient Factory (iPTF) of iPTF14yb, a luminous (M_r ≈ 27.8 mag), cosmological (redshift 1.9733), rapidly fading optical transient. We demonstrate, based on probabilistic arguments and a comparison with the broader population, that iPTF14yb is the optical afterglow of the long-duration gamma-ray burst GRB 140226A. This marks the first unambiguous discovery of a GRB afterglow prior to (and thus entirely independent of) an associated high-energy trigger. We estimate the rate of iPTF14yb-like sources (i.e., cosmologically distant relativistic explosions) based on iPTF observations, inferring an all-sky value of yr^−1 (68% confidence interval of...

  3. Strong Ultraviolet Pulse From a Newborn Type Ia Supernova

    Cao, Yi; Kulkarni, S. R.; Howell, D. Andrew; Gal-Yam, Avishay; Kasliwal, Mansi Manoj; Valenti, Stefano; Johansson, J.; Amanullah, R.; Goobar, A.; Sollerman, J.; Taddia, F.; Horesh, Assaf; Sagiv, Ilan; Cenko, S. Bradley; Nugent, Peter E.; Arcavi, Iair; Surace, Jason; Woźniak, P. R.; Moody, Daniela I.; Rebbapragada, Umaa D.; Bue, Brian D.; Gehrels, Neil
    Type Ia supernovae are destructive explosions of carbon-oxygen white dwarfs. Although they are used empirically to measure cosmological distances, the nature of their progenitors remains mysterious. One of the leading progenitor models, called the single degenerate channel, hypothesizes that a white dwarf accretes matter from a companion star and the resulting increase in its central pressure and temperature ignites thermonuclear explosion. Here we report observations with the Swift Space Telescope of strong but declining ultraviolet emission from a type Ia supernova within four days of its explosion. This emission is consistent with theoretical expectations of collision between material ejected by...

  4. Strong Ultraviolet Pulse From a Newborn Type Ia Supernova

    Cao, Yi; Kulkarni, S. R.; Howell, D. Andrew; Gal-Yam, Avishay; Kasliwal, Mansi Manoj; Valenti, Stefano; Johansson, J.; Amanullah, R.; Goobar, A.; Sollerman, J.; Taddia, F.; Horesh, Assaf; Sagiv, Ilan; Cenko, S. Bradley; Nugent, Peter E.; Arcavi, Iair; Surace, Jason; Woźniak, P. R.; Moody, Daniela I.; Rebbapragada, Umaa D.; Bue, Brian D.; Gehrels, Neil
    Type Ia supernovae are destructive explosions of carbon-oxygen white dwarfs. Although they are used empirically to measure cosmological distances, the nature of their progenitors remains mysterious. One of the leading progenitor models, called the single degenerate channel, hypothesizes that a white dwarf accretes matter from a companion star and the resulting increase in its central pressure and temperature ignites thermonuclear explosion. Here we report observations with the Swift Space Telescope of strong but declining ultraviolet emission from a type Ia supernova within four days of its explosion. This emission is consistent with theoretical expectations of collision between material ejected by...

  5. The Palomar Transient Factory

    Nugent, Peter; Cao, Yi; Kasliwal, Mansi
    Astrophysics is transforming from a data-starved to a data-swamped discipline, fundamentally changing the nature of scientific inquiry and discovery. New technologies are enabling the detection, transmission, and storage of data of hitherto unimaginable quantity and quality across the electromagnetic, gravity and particle spectra. The observational data obtained during this decade alone will supersede everything accumulated over the preceding four thousand years of astronomy. Currently there are 4 large-scale photometric and spectroscopic surveys underway, each generating and/or utilizing hundreds of terabytes of data per year. Some will focus on the static universe while others will greatly expand our knowledge of transient...

  6. Magnetic Cataclysmic Variables Discovered in the Palomar Transient Factory

    Margon, Bruce; Levitan, David; Prince, Thomas A.; Hallinan, Gregg
    The Palomar Transient Factory proves to be a prolific source of Magnetic Cataclysmic Variables, selected by their distinctive photometric variability, and followed up spectroscopically. Here, we present six new candidate systems, together with preliminary photometric periods and spectra.

  7. Long-term photometric behaviour of outbursting AM CVn systems

    Levitan, David; Groot, Paul J.; Prince, Thomas A.; Kulkarni, Shrinivas R.; Laher, Russ; Ofek, Eran O.; Sesar, Branimir; Surace, Jason
    The AM CVn systems are a class of He-rich, post-period minimum, semidetached, ultracompact binaries. Their long-term light curves have been poorly understood due to the few systems known and the long (hundreds of days) recurrence times between outbursts. We present combined photometric light curves from the Lincoln Near Earth Asteroid Research, Catalina Real-Time Transient Survey, and Palomar Transient Factory synoptic surveys to study the photometric variability of these systems over an almost 10 yr period. These light curves provide a much clearer picture of the outburst phenomena that these systems undergo. We characterize the photometric behaviour of most known outbursting AM...

  8. Long-term photometric behaviour of outbursting AM CVn systems

    Levitan, David; Groot, Paul J.; Prince, Thomas A.; Kulkarni, Shrinivas R.; Laher, Russ; Ofek, Eran O.; Sesar, Branimir; Surace, Jason
    The AM CVn systems are a class of He-rich, post-period minimum, semidetached, ultracompact binaries. Their long-term light curves have been poorly understood due to the few systems known and the long (hundreds of days) recurrence times between outbursts. We present combined photometric light curves from the Lincoln Near Earth Asteroid Research, Catalina Real-Time Transient Survey, and Palomar Transient Factory synoptic surveys to study the photometric variability of these systems over an almost 10 yr period. These light curves provide a much clearer picture of the outburst phenomena that these systems undergo. We characterize the photometric behaviour of most known outbursting AM...

  9. Long-term photometric behaviour of outbursting AM CVn systems

    Levitan, David; Groot, Paul J.; Prince, Thomas A.; Kulkarni, Shrinivas R.; Laher, Russ; Ofek, Eran O.; Sesar, Branimir; Surace, Jason
    The AM CVn systems are a class of He-rich, post-period minimum, semidetached, ultracompact binaries. Their long-term light curves have been poorly understood due to the few systems known and the long (hundreds of days) recurrence times between outbursts. We present combined photometric light curves from the Lincoln Near Earth Asteroid Research, Catalina Real-Time Transient Survey, and Palomar Transient Factory synoptic surveys to study the photometric variability of these systems over an almost 10 yr period. These light curves provide a much clearer picture of the outburst phenomena that these systems undergo. We characterize the photometric behaviour of most known outbursting AM...

  10. Long-term photometric behaviour of outbursting AM CVn systems

    Levitan, David; Groot, Paul J.; Prince, Thomas A.; Kulkarni, Shrinivas R.; Laher, Russ; Ofek, Eran O.; Sesar, Branimir; Surace, Jason
    The AM CVn systems are a class of He-rich, post-period minimum, semidetached, ultracompact binaries. Their long-term light curves have been poorly understood due to the few systems known and the long (hundreds of days) recurrence times between outbursts. We present combined photometric light curves from the Lincoln Near Earth Asteroid Research, Catalina Real-Time Transient Survey, and Palomar Transient Factory synoptic surveys to study the photometric variability of these systems over an almost 10 yr period. These light curves provide a much clearer picture of the outburst phenomena that these systems undergo. We characterize the photometric behaviour of most known outbursting AM...

  11. iPTF13beo: the double-peaked light curve of a Type Ibn supernova discovered shortly after explosion

    Gorbikov, Evgeny; Gal-Yam, Avishay; Ofek, Eran O.; Vreeswijk, Paul M.; Nugent, Peter E.; Chotard, Nicolas; Kulkarni, Shrinivas R.; Cao, Yi; De Cia, Annalisa; Yaron, Ofer; Tal, David; Arcavi, Iair; Kasliwal, Mansi M.; Cenko, S. Bradley; Sullivan, Mark; Chen, Juncheng
    We present optical photometric and spectroscopic observations of the Type Ibn (SN 2006jc-like) supernova (SN) iPTF13beo. Detected by the intermediate Palomar Transient Factory ∼3 h after the estimated first light, iPTF13beo is the youngest and the most distant (∼430 Mpc) Type Ibn event ever observed. The iPTF13beo light curve is consistent with light curves of other Type Ibn SNe and with light curves of fast Type Ic events, but with a slightly faster rise-time of two days. In addition, the iPTF13beo R-band light curve exhibits a double-peak structure separated by ∼9 d, not observed before in any Type Ibn SN....

  12. iPTF13beo: the double-peaked light curve of a Type Ibn supernova discovered shortly after explosion

    Gorbikov, Evgeny; Gal-Yam, Avishay; Ofek, Eran O.; Vreeswijk, Paul M.; Nugent, Peter E.; Chotard, Nicolas; Kulkarni, Shrinivas R.; Cao, Yi; De Cia, Annalisa; Yaron, Ofer; Tal, David; Arcavi, Iair; Kasliwal, Mansi M.; Cenko, S. Bradley; Sullivan, Mark; Chen, Juncheng
    We present optical photometric and spectroscopic observations of the Type Ibn (SN 2006jc-like) supernova (SN) iPTF13beo. Detected by the intermediate Palomar Transient Factory ∼3 h after the estimated first light, iPTF13beo is the youngest and the most distant (∼430 Mpc) Type Ibn event ever observed. The iPTF13beo light curve is consistent with light curves of other Type Ibn SNe and with light curves of fast Type Ic events, but with a slightly faster rise-time of two days. In addition, the iPTF13beo R-band light curve exhibits a double-peak structure separated by ∼9 d, not observed before in any Type Ibn SN....

  13. Optical follow-up observations of PTF10qts, a luminous broad-lined Type Ic supernova found by the Palomar Transient Factory

    Walker, E. S.; Mazzali, P. A.; Pian, E.; Hurley, K.; Arcavi, I.; Cenko, S. B.; Gal-Yam, A.; Horesh, A.; Kasliwal, M.; Poznanski, D.; Silverman, J. M.; Sullivan, M.; Bloom, J. S.; Filippenko, A. V.; Kulkarni, S. R.; Nugent, P. E.; Ofek, E.; Barthelmy, S.; Boynton, W.; Goldsten, J.; Golenetskii, S.; Ohno, M.; Tashiro, M. S.; Yamaoka, K.; Zhang, X. L.
    We present optical photometry and spectroscopy of the broad-lined Type Ic supernova (SN Ic-BL) PTF10qts, which was discovered as part of the Palomar Transient Factory. The SN was located in a dwarf galaxy of magnitude r = 21.1 at a redshift z = 0.0907. We find that the R-band light curve is a poor proxy for bolometric data and use photometric and spectroscopic data to construct and constrain the bolometric light curve. The derived bolometric magnitude at maximum light is M_bol = −18.51 ± 0.2 mag, comparable to that of SN 1998bw (M_bol = −18.7 mag) which was associated with...

  14. Optical follow-up observations of PTF10qts, a luminous broad-lined Type Ic supernova found by the Palomar Transient Factory

    Walker, E. S.; Mazzali, P. A.; Pian, E.; Hurley, K.; Arcavi, I.; Cenko, S. B.; Gal-Yam, A.; Horesh, A.; Kasliwal, M.; Poznanski, D.; Silverman, J. M.; Sullivan, M.; Bloom, J. S.; Filippenko, A. V.; Kulkarni, S. R.; Nugent, P. E.; Ofek, E.; Barthelmy, S.; Boynton, W.; Goldsten, J.; Golenetskii, S.; Ohno, M.; Tashiro, M. S.; Yamaoka, K.; Zhang, X. L.
    We present optical photometry and spectroscopy of the broad-lined Type Ic supernova (SN Ic-BL) PTF10qts, which was discovered as part of the Palomar Transient Factory. The SN was located in a dwarf galaxy of magnitude r = 21.1 at a redshift z = 0.0907. We find that the R-band light curve is a poor proxy for bolometric data and use photometric and spectroscopic data to construct and constrain the bolometric light curve. The derived bolometric magnitude at maximum light is M_bol = −18.51 ± 0.2 mag, comparable to that of SN 1998bw (M_bol = −18.7 mag) which was associated with...

  15. Optical follow-up observations of PTF10qts, a luminous broad-lined Type Ic supernova found by the Palomar Transient Factory

    Walker, E. S.; Mazzali, P. A.; Pian, E.; Hurley, K.; Arcavi, I.; Cenko, S. B.; Gal-Yam, A.; Horesh, A.; Kasliwal, M.; Poznanski, D.; Silverman, J. M.; Sullivan, M.; Bloom, J. S.; Filippenko, A. V.; Kulkarni, S. R.; Nugent, P. E.; Ofek, E.; Barthelmy, S.; Boynton, W.; Goldsten, J.; Golenetskii, S.; Ohno, M.; Tashiro, M. S.; Yamaoka, K.; Zhang, X. L.
    We present optical photometry and spectroscopy of the broad-lined Type Ic supernova (SN Ic-BL) PTF10qts, which was discovered as part of the Palomar Transient Factory. The SN was located in a dwarf galaxy of magnitude r = 21.1 at a redshift z = 0.0907. We find that the R-band light curve is a poor proxy for bolometric data and use photometric and spectroscopic data to construct and constrain the bolometric light curve. The derived bolometric magnitude at maximum light is M_bol = −18.51 ± 0.2 mag, comparable to that of SN 1998bw (M_bol = −18.7 mag) which was associated with...

  16. IPAC Image Processing and Data Archiving for the Palomar Transient Factory

    Laher, Russ R.; Surace, Jason; Grillmair, Carl J.; Jackson, Ed; Desai, Vandana; Levitan, David; Sesar, Branimir; Quimby, Robert; Kasliwal, Mansi; Horesh, Assaf; Bellm, Eric; Barlow, Tom; Prince, Thomas A.; Kulkarni, Shrinivas R.; Helou, George; Hamam, Nouhad; Masci, Frank J.; Mi, Wei; Groom, Steve; Teplitz, Harry; Hale, David; Smith, Roger; Waszczak, Adam
    The Palomar Transient Factory (PTF) is a multiepochal robotic survey of the northern sky that acquires data for the scientific study of transient and variable astrophysical phenomena. The camera and telescope provide for wide-field imaging in optical bands. In the five years of operation since first light on 2008 December 13, images taken with Mould-R and SDSS-g′ camera filters have been routinely acquired on a nightly basis (weather permitting), and two different Hα filters were installed in 2011 May (656 and 663 nm). The PTF image-processing and data-archival program at the Infrared Processing and Analysis Center (IPAC) is tailored to...

  17. Interaction-powered Supernovae: Rise-time versus Peak-luminosity Correlation and the Shock-breakout Velocity

    Ofek, Eran O.; Arcavi, Iair; Tal, David; Sullivan, Mark; Gal-Yam, Avishay; Kulkarni, Shrinivas R.; Nugent, Peter E.; Ben-Ami, Sagi; Bersier, David; Cao, Yi; Cenko, S. Bradley; De Cia, Annalisa; Filippenko, Alexei V.; Fransson, Claes; Kasliwal, Mansi M.; Laher, Russ R.; Surace, Jason; Quimby, Robert M.; Yaron, Ofer
    Interaction of supernova (SN) ejecta with the optically thick circumstellar medium (CSM) of a progenitor star can result in a bright, long-lived shock-breakout event. Candidates for such SNe include Type IIn and superluminous SNe. If some of these SNe are powered by interaction, then there should be a specific relation between their peak luminosity, bolometric light-curve rise time, and shock-breakout velocity. Given that the shock velocity during shock breakout is not measured, we expect a correlation, with a significant spread, between the rise time and the peak luminosity of these SNe. Here, we present a sample of 15 SNe IIn...

  18. Interaction-powered Supernovae: Rise-time versus Peak-luminosity Correlation and the Shock-breakout Velocity

    Ofek, Eran O.; Arcavi, Iair; Tal, David; Sullivan, Mark; Gal-Yam, Avishay; Kulkarni, Shrinivas R.; Nugent, Peter E.; Ben-Ami, Sagi; Bersier, David; Cao, Yi; Cenko, S. Bradley; De Cia, Annalisa; Filippenko, Alexei V.; Fransson, Claes; Kasliwal, Mansi M.; Laher, Russ R.; Surace, Jason; Quimby, Robert M.; Yaron, Ofer
    Interaction of supernova (SN) ejecta with the optically thick circumstellar medium (CSM) of a progenitor star can result in a bright, long-lived shock-breakout event. Candidates for such SNe include Type IIn and superluminous SNe. If some of these SNe are powered by interaction, then there should be a specific relation between their peak luminosity, bolometric light-curve rise time, and shock-breakout velocity. Given that the shock velocity during shock breakout is not measured, we expect a correlation, with a significant spread, between the rise time and the peak luminosity of these SNe. Here, we present a sample of 15 SNe IIn...

  19. Interaction-powered Supernovae: Rise-time versus Peak-luminosity Correlation and the Shock-breakout Velocity

    Ofek, Eran O.; Arcavi, Iair; Tal, David; Sullivan, Mark; Gal-Yam, Avishay; Kulkarni, Shrinivas R.; Nugent, Peter E.; Ben-Ami, Sagi; Bersier, David; Cao, Yi; Cenko, S. Bradley; De Cia, Annalisa; Filippenko, Alexei V.; Fransson, Claes; Kasliwal, Mansi M.; Laher, Russ R.; Surace, Jason; Quimby, Robert M.; Yaron, Ofer
    Interaction of supernova (SN) ejecta with the optically thick circumstellar medium (CSM) of a progenitor star can result in a bright, long-lived shock-breakout event. Candidates for such SNe include Type IIn and superluminous SNe. If some of these SNe are powered by interaction, then there should be a specific relation between their peak luminosity, bolometric light-curve rise time, and shock-breakout velocity. Given that the shock velocity during shock breakout is not measured, we expect a correlation, with a significant spread, between the rise time and the peak luminosity of these SNe. Here, we present a sample of 15 SNe IIn...

  20. 313 New Asteroid Rotation Periods from Palomar Transient Factory Observations

    Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; Waszczak, Adam; Kulkarni, Shrinivas R.; Levitan, David; Sesar, Branimir; Laher, Russ; Surace, Jason; Prince, Thomas A.
    A new asteroid rotation period survey has been carried out by using the Palomar Transient Factory (PTF). Twelve consecutive PTF fields, which covered an area of 87 deg^2 in the ecliptic plane, were observed in the R band with a cadence of ~20 minutes during 2013 February 15-18. We detected 2500 known asteroids with a diameter range of 0.5 km ≤ D ≤ 200 km. Of these, 313 objects had highly reliable rotation periods and exhibited the "spin barrier" at ~2 hr. In contrast to the flat spin-rate distribution of the asteroids with 3 km ≤ D ≤ 15 km...

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