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J/ApJ/844/46  Photometry of the transient event iPTF16fnl  (Blagorodnova+, 2017)

iPTF16fnl: a faint and fast tidal disruption event in an E+A galaxy. 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. <Astrophys. J., 844, 46 (2017)> =2017ApJ...844...46B
ADC_Keywords: Photometry, UBV ; Photometry, ultraviolet ; Photometry, SDSS Keywords: accretion, accretion disks; black hole physics; galaxies: nuclei; stars: individual (iPTF16fnl) Abstract: 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 66.6Mpc. The light curve of the object peaked at an absolute mag Mg=-17.2. The maximum bolometric luminosity (from optical and UV) was Lp~(1.0±0.15)x1043erg/s, 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∝e-(t-t0_)/τ^, where t0=57631.0 (MJD) and τ∼15 days. The X-ray shows a marginal detection at LX=2.4-1.11.9x1039erg/s (Swift X-ray Telescope). No radio counterpart was detected down to 3σ, providing upper limits for monochromatic radio luminosities of νLν<2.3x1036erg/s and νLν<1.7x1037erg/s (Very Large Array, 6.1 and 22GHz). The blackbody temperature, obtained from combined Swift UV and optical photometry, shows a constant value of 19000K. The transient spectrum at peak is characterized by broad HeII and Hα emission lines, with FWHMs of about 14000km/s and 10000km/s, respectively. HeI lines are also detected at λλ5875 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 ∼650Myr and solar metallicity. The characteristics of iPTF16fnl make it an outlier on both luminosity and decay timescales, as compared to other optically selected TDEs. 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. Description: On the night after discovery (2016 August 29th), we observed the source with the FLOYDS spectrograph on the Las Cumbres Observatory (LCO) 2m telescope and the Spectral Energy Distribution Machine (SEDM) on the Palomar 60 inch (P60) telescope. The SEDM is a ultra-low resolution (R∼100) integral-field-unit (IFU) spectrograph. Following spectroscopic identification of iPTF16fnl as a tidal disruption event (TDE) candidate, the source was monitored at Palomar and by the Ultraviolet and Optical Telescope (UVOT) on board the Swift observatory. The UVOT observations were taken in UVW2, UVM2, UVW1, U, B, and V. At Palomar, photometry in the g and Mould-R bands were obtained with the iPTF mosaic wide-field camera on the Palomar 48-inch telescope (P48). Table 3 reports the measured Swift aperture photometry magnitudes and the difference-imaging photometry for the Palomar data spanning 2016 Aug to 2016 Dec. Radio follow-up observations of iPTF16fnl were taken with the Jansky Very Large Array (VLA; PI A. Horesh), the Arcminute Microkelvin Imager (AMI; PI K. Mooley) and the James Clerk Maxwell Telescope and the Submillimetre Common-User Bolometer Array 2 (JCMT/SCUBA-2; PI A. K. H. Kong). We also observed the location of iPTF16fnl with the X-Ray Telescope (XRT) on board the Swift satellite beginning at 19:32 UT on 30 August 2016. Regular monitoring of the field in photon counting mode continued over the course of the next four months (PIs T. Holoien and B. Cenko). Objects: ---------------------------------------------------------- RA (ICRS) DE Designation(s) ---------------------------------------------------------- 00 29 57.04 +32 53 37.5 iPTF16fnl = iPTF 16fnl ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 130 69 Optical and UV photometry of iPTF16fnl in AB magnitude system
See also: IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) II/313 : Palomar Transient Factory (PTF) catalog 1.0 (Ofek+, 2012) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/AJ/116/1094 : MAPS-PP catalog of galaxies (Cabanela+, 1998) J/ApJS/122/51 : Spectroscopy of 10 rich galaxy clusters (Dressler+ 1999) J/ApJS/170/33 : Optical properties of Markarian galaxies (Petrosian+, 2007) J/ApJ/676/944 : GALEX & CFHTLS cand. tidal disruption events (Gezari+, 2008) J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009) J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009) J/ApJ/793/38 : PTF photometric observations (Arcavi+, 2014) J/A+A/593/A68 : PTF12os & iPTF13bvn spectra & light curves (Fremling+, 2016) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 F7.1 d MJD [57626.4/57724.7] Modified Julian Date, JD-240000.5 9- 18 A10 --- Tel Telescope+Instrument Used (Swift+UVOT, P48+CFH12k or P60+SEDM) 20- 24 F5.2 mag UVW1mag [16.8/18.9]? Swift/UVOT UVW1 passband AB magnitude 26- 29 F4.2 mag e_UVW1mag [0.04/0.08]? Uncertainty in UVW1mag 31- 35 F5.2 mag UVM2mag [16.9/19.4]? Swift/UVOT UVM2 passband AB magnitude 37- 40 F4.2 mag e_UVM2mag [0.04/0.2]? Uncertainty in UVM2mag 42- 46 F5.2 mag UVW2mag [16.6/19.5]? Swift/UVOT UVW2 passband AB magnitude 48- 51 F4.2 mag e_UVW2mag [0.04/0.08]? Uncertainty in UVW2mag 53- 57 F5.2 mag Umag [16.3/17.5]? Swift/UVOT U passband AB magnitude 59- 62 F4.2 mag e_Umag [0.04/0.07]? Uncertainty in Umag 64- 68 F5.2 mag Bmag [15.6/16.1]? Swift/UVOT B passband AB magnitude 70- 73 F4.2 mag e_Bmag [0.03/0.05]? Uncertainty in Bmag 75- 79 F5.2 mag Vmag [15.1/15.7]? Swift/UVOT V passband AB magnitude 81- 84 F4.2 mag e_Vmag [0.04/0.07]? Uncertainty in Vmag 86- 90 F5.2 mag umag [17.1/19.8]? Palomar u' passband AB magnitude in SDSS system 92- 95 F4.2 mag e_umag [0.07/0.3]? Uncertainty in umag 97-101 F5.2 mag gmag [17.1/20.8]? Palomar g' passband AB magnitude in SDSS system (1) 103-107 F5.2 mag e_gmag [0.06/0.4]? Uncertainty in gmag 109-113 F5.2 mag rmag [17.3/20.9]? Palomar r' passband AB magnitude in SDSS system (1) 115-119 F5.2 mag e_rmag [0.06/0.4]? Uncertainty in rmag 121-125 F5.2 mag imag [17.2/19]? Palomar i' passband AB magnitude, in SDSS system 127-130 F4.2 mag e_imag [0.07/0.4]? Uncertainty in image
Note (1): If the uncertainty in a measured magnitude is null (blank) then the magnitude value should be considered an upper limit.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 06-Mar-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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