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iPTF16fnl: A Faint and Fast Tidal Disruption Event in an E+A Galaxy

Here, we present ground-based and Swift observations of iPTF16fnl, a likely tidal disruption event (TDE) discovered by the intermediate Palomar Transient Factory (iPTF) survey at 66.6 Mpc. The light curve of the object peaked at an absolute mag ${M}_{g}=-17.2$. The maximum bolometric luminosity (fro... Full description

Journal Title: The Astrophysical Journal (Online) 20 July 2017, Vol.844(1)
Main Author: Blagorodnova, N
Other Authors: Gezari, S , Hung, T , Kulkarni, S. R , Cenko, S. B , Pasham, D. R , Yan, L , Arcavi, I , Ben-Ami, S , Bue, B. D , Cantwell, T , Cao, Y , Castro-Tirado, A. J , Fender, R , Fremling, C , Gal-Yam, A , Ho, A. Y. Q , Horesh, A , Hosseinzadeh, G , Kasliwal, M. M , Kong, A. K. H , Laher, R. R , Leloudas, G , Lunnan, R , Masci, F. J , Mooley, K , Neill, J. D , Nugent, P , Powell, M , Valeev, A. F , Vreeswijk, P. M , Walters, R , Wozniak, P
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 1538-4357 ; E-ISSN: 1538-4357 ; DOI: 10.3847/1538-4357/aa7579
Link: https://www.osti.gov/servlets/purl/1412867
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title: iPTF16fnl: A Faint and Fast Tidal Disruption Event in an E+A Galaxy
format: Article
creator:
  • Blagorodnova, N
  • Gezari, S
  • Hung, T
  • Kulkarni, S. R
  • Cenko, S. B
  • Pasham, D. R
  • Yan, L
  • Arcavi, I
  • Ben-Ami, S
  • Bue, B. D
  • Cantwell, T
  • Cao, Y
  • Castro-Tirado, A. J
  • Fender, R
  • Fremling, C
  • Gal-Yam, A
  • Ho, A. Y. Q
  • Horesh, A
  • Hosseinzadeh, G
  • Kasliwal, M. M
  • Kong, A. K. H
  • Laher, R. R
  • Leloudas, G
  • Lunnan, R
  • Masci, F. J
  • Mooley, K
  • Neill, J. D
  • Nugent, P
  • Powell, M
  • Valeev, A. F
  • Vreeswijk, P. M
  • Walters, R
  • Wozniak, P
subjects:
  • Astronomy And Astrophysics
  • Astronomy and Astrophysics
  • Accretion, Accretion Disks
  • Black Hole Physics
  • Galaxies Nuclei
  • Stars Individual (Iptf16fnl)
  • Astronomy & Astrophysics
  • Physics
ispartof: The Astrophysical Journal (Online), 20 July 2017, Vol.844(1)
description: Here, we present ground-based and Swift observations of iPTF16fnl, a likely tidal disruption event (TDE) discovered by the intermediate Palomar Transient Factory (iPTF) survey at 66.6 Mpc. The light curve of the object peaked at an absolute mag ${M}_{g}=-17.2$. The maximum bolometric luminosity (from optical and UV) was ${L}_{p}\simeq (1.0\pm 0.15)\times {10}^{43}$ erg s-1, an order of magnitude fainter than any other optical TDE discovered so far. The luminosity in the first 60 days is consistent with an exponential decay, with $L\propto {e}^{-(t-{t}_{0})/\tau }$, where t0 = 57631.0 (MJD) and $\tau \simeq 15$ days. The X-ray shows a marginal detection at ${L}_{X}={2.4}_{-1.1}^{1.9}\times {10}^{39}$ erg s-1 (Swift X-ray Telescope). No radio counterpart was detected down to 3σ, providing upper limits for monochromatic radio luminosities of ${\nu L}_{\nu }\lt 2.3\times {10}^{36}$ erg s-1 and ${\nu L}_{\nu }\lt 1.7\times {10}^{37}$ erg s-1 (Very Large Array, 6.1 and 22 GHz). The blackbody temperature, obtained from combined Swift UV and optical photometry, shows a constant value of 19,000 K. The transient spectrum at peak is characterized by broad He ii and Hα emission lines, with FWHMs of about 14,000 km s-1 and 10,000 km s-1, respectively. He i lines are also detected at λλ 5875 and 6678. The spectrum of the host is dominated by strong Balmer absorption lines, which are consistent with a post-starburst (E+A) galaxy with an age of ~650 Myr and solar metallicity. The characteristics of iPTF16fnl make it an outlier on both luminosity and decay timescales, as compared to other optically selected TDEs. In conclusion, the discovery of such a faint optical event suggests a higher rate of tidal disruptions, as low-luminosity events may have gone unnoticed in previous searches.
language: eng
source:
identifier: ISSN: 1538-4357 ; E-ISSN: 1538-4357 ; DOI: 10.3847/1538-4357/aa7579
fulltext: fulltext
issn:
  • 1538-4357
  • 15384357
url: Link


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titleiPTF16fnl: A Faint and Fast Tidal Disruption Event in an E+A Galaxy
creatorBlagorodnova, N ; Gezari, S ; Hung, T ; Kulkarni, S. R ; Cenko, S. B ; Pasham, D. R ; Yan, L ; Arcavi, I ; Ben-Ami, S ; Bue, B. D ; Cantwell, T ; Cao, Y ; Castro-Tirado, A. J ; Fender, R ; Fremling, C ; Gal-Yam, A ; Ho, A. Y. Q ; Horesh, A ; Hosseinzadeh, G ; Kasliwal, M. M ; Kong, A. K. H ; Laher, R. R ; Leloudas, G ; Lunnan, R ; Masci, F. J ; Mooley, K ; Neill, J. D ; Nugent, P ; Powell, M ; Valeev, A. F ; Vreeswijk, P. M ; Walters, R ; Wozniak, P
contributorLos Alamos National Lab. (Lanl), Los Alamos, Nm (United States) (Corporate Author) ; Lawrence Berkeley National Lab. (Lbnl), Berkeley, Ca (United States) (Corporate Author)
ispartofThe Astrophysical Journal (Online), 20 July 2017, Vol.844(1)
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subjectAstronomy And Astrophysics ; Astronomy and Astrophysics ; Accretion, Accretion Disks ; Black Hole Physics ; Galaxies Nuclei ; Stars Individual (Iptf16fnl) ; Astronomy & Astrophysics ; Physics
descriptionHere, we present ground-based and Swift observations of iPTF16fnl, a likely tidal disruption event (TDE) discovered by the intermediate Palomar Transient Factory (iPTF) survey at 66.6 Mpc. The light curve of the object peaked at an absolute mag ${M}_{g}=-17.2$. The maximum bolometric luminosity (from optical and UV) was ${L}_{p}\simeq (1.0\pm 0.15)\times {10}^{43}$ erg s-1, an order of magnitude fainter than any other optical TDE discovered so far. The luminosity in the first 60 days is consistent with an exponential decay, with $L\propto {e}^{-(t-{t}_{0})/\tau }$, where t0 = 57631.0 (MJD) and $\tau \simeq 15$ days. The X-ray shows a marginal detection at ${L}_{X}={2.4}_{-1.1}^{1.9}\times {10}^{39}$ erg s-1 (Swift X-ray Telescope). No radio counterpart was detected down to 3σ, providing upper limits for monochromatic radio luminosities of ${\nu L}_{\nu }\lt 2.3\times {10}^{36}$ erg s-1 and ${\nu L}_{\nu }\lt 1.7\times {10}^{37}$ erg s-1 (Very Large Array, 6.1 and 22 GHz). The blackbody temperature, obtained from combined Swift UV and optical photometry, shows a constant value of 19,000 K. The transient spectrum at peak is characterized by broad He ii and Hα emission lines, with FWHMs of about 14,000 km s-1 and 10,000 km s-1, respectively. He i lines are also detected at λλ 5875 and 6678. The spectrum of the host is dominated by strong Balmer absorption lines, which are consistent with a post-starburst (E+A) galaxy with an age of ~650 Myr and solar metallicity. The characteristics of iPTF16fnl make it an outlier on both luminosity and decay timescales, as compared to other optically selected TDEs. In conclusion, the discovery of such a faint optical event suggests a higher rate of tidal disruptions, as low-luminosity events may have gone unnoticed in previous searches.
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titleiPTF16fnl: A Faint and Fast Tidal Disruption Event in an E+A Galaxy
description

Here, we present ground-based and Swift observations of iPTF16fnl, a likely tidal disruption event (TDE) discovered by the intermediate Palomar Transient Factory (iPTF) survey at 66.6 Mpc. The light curve of the object peaked at an absolute mag ${M}_{g}=-17.2$. The maximum bolometric luminosity (from optical and UV) was ${L}_{p}\simeq (1.0\pm 0.15)\times {10}^{43}$ erg s-1, an order of magnitude fainter than any other optical TDE discovered so far. The luminosity in the first 60 days is consistent with an exponential decay, with $L\propto {e}^{-(t-{t}_{0})/\tau }$, where t0 = 57631.0 (MJD) and $\tau \simeq 15$ days. The X-ray shows a marginal detection at ${L}_{X}={2.4}_{-1.1}^{1.9}\times {10}^{39}$ erg s-1 (Swift X-ray Telescope). No radio counterpart was detected down to 3σ, providing upper limits for monochromatic radio luminosities of ${\nu L}_{\nu }\lt 2.3\times {10}^{36}$ erg s-1 and ${\nu L}_{\nu }\lt 1.7\times {10}^{37}$ erg s-1 (Very Large Array, 6.1 and 22 GHz). The blackbody temperature, obtained from combined Swift UV and optical photometry, shows a constant value of 19,000 K. The transient spectrum at peak is characterized by broad He ii and Hα emission lines, with FWHMs of about 14,000 km s-1 and 10,000 km s-1, respectively. He i lines are also detected at λλ 5875 and 6678. The spectrum of the host is dominated by strong Balmer absorption lines, which are consistent with a post-starburst (E+A) galaxy with an age of ~650 Myr and solar metallicity. The characteristics of iPTF16fnl make it an outlier on both luminosity and decay timescales, as compared to other optically selected TDEs. In conclusion, the discovery of such a faint optical event suggests a higher rate of tidal disruptions, as low-luminosity events may have gone unnoticed in previous searches.

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titleiPTF16fnl: A Faint and Fast Tidal Disruption Event in an E+A Galaxy
authorBlagorodnova, N ; Gezari, S ; Hung, T ; Kulkarni, S. R ; Cenko, S. B ; Pasham, D. R ; Yan, L ; Arcavi, I ; Ben-Ami, S ; Bue, B. D ; Cantwell, T ; Cao, Y ; Castro-Tirado, A. J ; Fender, R ; Fremling, C ; Gal-Yam, A ; Ho, A. Y. Q ; Horesh, A ; Hosseinzadeh, G ; Kasliwal, M. M ; Kong, A. K. H ; Laher, R. R ; Leloudas, G ; Lunnan, R ; Masci, F. J ; Mooley, K ; Neill, J. D ; Nugent, P ; Powell, M ; Valeev, A. F ; Vreeswijk, P. M ; Walters, R ; Wozniak, P
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Here, we present ground-based and Swift observations of iPTF16fnl, a likely tidal disruption event (TDE) discovered by the intermediate Palomar Transient Factory (iPTF) survey at 66.6 Mpc. The light curve of the object peaked at an absolute mag ${M}_{g}=-17.2$. The maximum bolometric luminosity (from optical and UV) was ${L}_{p}\simeq (1.0\pm 0.15)\times {10}^{43}$ erg s-1, an order of magnitude fainter than any other optical TDE discovered so far. The luminosity in the first 60 days is consistent with an exponential decay, with $L\propto {e}^{-(t-{t}_{0})/\tau }$, where t0 = 57631.0 (MJD) and $\tau \simeq 15$ days. The X-ray shows a marginal detection at ${L}_{X}={2.4}_{-1.1}^{1.9}\times {10}^{39}$ erg s-1 (Swift X-ray Telescope). No radio counterpart was detected down to 3σ, providing upper limits for monochromatic radio luminosities of ${\nu L}_{\nu }\lt 2.3\times {10}^{36}$ erg s-1 and ${\nu L}_{\nu }\lt 1.7\times {10}^{37}$ erg s-1 (Very Large Array, 6.1 and 22 GHz). The blackbody temperature, obtained from combined Swift UV and optical photometry, shows a constant value of 19,000 K. The transient spectrum at peak is characterized by broad He ii and Hα emission lines, with FWHMs of about 14,000 km s-1 and 10,000 km s-1, respectively. He i lines are also detected at λλ 5875 and 6678. The spectrum of the host is dominated by strong Balmer absorption lines, which are consistent with a post-starburst (E+A) galaxy with an age of ~650 Myr and solar metallicity. The characteristics of iPTF16fnl make it an outlier on both luminosity and decay timescales, as compared to other optically selected TDEs. In conclusion, the discovery of such a faint optical event suggests a higher rate of tidal disruptions, as low-luminosity events may have gone unnoticed in previous searches.

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date2017-07-20