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J/ApJ/834/107    Follow-up photometry of M101 OT2015-1    (Blagorodnova+, 2017)

Common envelope ejection for a luminous red nova in M101. Blagorodnova N., Kotak R., Polshaw J., Kasliwal M.M., Cao Y., Cody A.M., Doran G.B., Elias-Rosa N., Fraser M., Fremling C., Gonzalez-Fernandez C., Harmanen J., Jencson J., Kankare E., Kudritzki R.-P., Kulkarni S.R., Magnier E., Manulis I., Masci F.J., Mattila S., Nugent P., Ochner P., Pastorello A., Reynolds T., Smith K., Sollerman J., Taddia F., Terreran G., Tomasella L., Turatto M., Vreeswijk P.M., Wozniak P., Zaggia S. <Astrophys. J., 834, 107-107 (2017)> =2017ApJ...834..107B (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, UBVRI ; Photometry, SDSS ; Novae Keywords: binaries: close; novae, cataclysmic variables; stars: individual: (M101 OT2015-1, PSN J14021678+5426205); stars: massive; stars: winds, outflows Abstract: We present the results of optical, near-infrared, and mid-infrared observations of M101 OT2015-1 (PSN J14021678+5426205), a luminous red transient in the Pinwheel galaxy (M101), spanning a total of 16 years. The light curve showed two distinct peaks with absolute magnitudes Mr≤-12.4 and Mr~-12, on 2014 November 11 and 2015 February 17, respectively. The spectral energy distributions during the second maximum show a cool outburst temperature of ∼3700K and low expansion velocities (~-300km/s) for the HI, CaII, BaII, and KI lines. From archival data spanning 15-8 years before the outburst, we find a single source consistent with the optically discovered transient, which we attribute to being the progenitor; it has properties consistent with being an F-type yellow supergiant with L∼8.7x104L, Teff∼7000K, and an estimated mass of M1=18±1M. This star has likely just finished the H-burning phase in the core, started expanding, and is now crossing the Hertzsprung gap. Based on the combination of observed properties, we argue that the progenitor is a binary system, with the more evolved system overfilling the Roche lobe. Comparison with binary evolution models suggests that the outburst was an extremely rare phenomenon, likely associated with the ejection of the common envelope of a massive star. The initial mass of the primary fills the gap between the merger candidates V838 Mon (5-10M) and NGC 4490-OT (30M). Description: The location of M101-OT2015-1 has been serendipitously imaged by numerous telescopes and instruments over the last 15 years (from 2000 to 2015). Our best quality pre-discovery image (seeing of 0.55") is an r-band exposure at -3625 days pre-peak from the Canada-France-Hawaii Telescope (CFHT). The historical optical data for M101-OT was retrieved from the CFHT MegaPrime and CFHT12K/Mosaic, using single and combined exposures, Pan-STARRS-1/GPC1 (PS1), Isaac Newton Telescope/Wide Field Camera (INT/WFC), and Sloan Digital Sky Survey (SDSS) DR 10 (Ahn+ 2014, see V/147). Unfortunately, there are no HST images covering the location of the source. Post-discovery optical magnitudes were obtained from the reported followup astronomer's telegrams (ATels), Liverpool Telescope (LT), the Nordic Optical Telescope (NOT), and the Palomar P48 and P60 telescopes. The infrared data were retrieved from CFHT/WIRCam, UKIRT/WFCAM, and the Spitzer Infrared Array Camera in 3.6 and 4.5um as part of the SPitzer InfraRed Intensive Transients Survey (SPIRITS) (Kasliwal+, 2017ApJ...839...88K). Details of pre-discovery photometry and post-discovery optical photometry may be found in the Appendices Tables 1 and 2, respectively. We obtained spectra of M101-OT using a range of facilities in 2015 Feb-Jul. Objects: -------------------------------------------------------- RA (ICRS) DE Designation(s) -------------------------------------------------------- 14 02 16.78 +54 26 20.5 M101 OT2015-1 = iPTF 13afz -------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 147 55 Historic photometric measurements of M101-OT2015-1 table2.dat 126 26 Post-discovery photometric measurements of M101-OT2015-1 table3.dat 54 97 iPTF follow-up data of M101-OT2015-1
See also: V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/ApJ/682/1205 : Fast transients in the Fornax cluster (Rau+, 2008) J/ApJ/705/1364 : MIR catalog of point sources in M33 (Thompson+, 2009) J/ApJ/715/1094 : Census of self-obscured massive stars (Khan+, 2010) J/ApJ/733/124 : Cepheids in M101 observed with HST (Shappee+, 2011) J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012) J/MNRAS/433/1312 : SN2009ip UBVRI, UVOT and JHK light curves (Fraser+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 F7.1 d Phase Phase 9- 14 F6.1 d MJD Modified Julian Date; MJD-50000 16- 23 A8 --- Tel Telescope used 25- 29 F5.2 mag Umag [20.3/21.3]? U band magnitude 31- 34 F4.2 mag e_Umag [0.02/0.2]? Uncertainty in Umag 36- 40 F5.2 mag Bmag [18.8/22]? B band magnitude 42- 45 F4.2 mag e_Bmag [0.02/0.3]? Uncertainty in Bmag 47 A1 --- l_Vmag Limit flag on Vmag 48- 52 F5.2 mag Vmag [16.3/21.9]? V band magnitude 54- 57 F4.2 mag e_Vmag [0.02/0.4]? Uncertainty in Vmag 59- 63 F5.2 mag Rmag [16.7/21.2]? R band magnitude 65- 68 F4.2 mag e_Rmag [0.02/0.2]? Uncertainty in Rmag 70- 74 F5.2 mag umag [21.7/23.1]? SDSS u band magnitude 76- 79 F4.2 mag e_umag [0.1/0.5]? Uncertainty in umag 81- 85 F5.2 mag gmag [20.4/21.8]? SDSS g band magnitude 87- 90 F4.2 mag e_gmag [0.07/0.4]? Uncertainty in gmag 92- 96 F5.2 mag rmag [19.7/21.9]? SDSS r band magnitude 98-101 F4.2 mag e_rmag [0.04/0.3]? Uncertainty in rmag 103-107 F5.2 mag imag [19.7/21.5]? SDSS i band magnitude 109-112 F4.2 mag e_imag [0.06/0.5]? Uncertainty in imag 114-118 F5.2 mag zmag [19.8/22]? SDSS z band magnitude 120-123 F4.2 mag e_zmag [0.04/0.6]? Uncertainty in zmag 125-129 F5.2 mag ymag [19.5/20.4]? y band magnitude 131-134 F4.2 mag e_ymag [0.1/0.3]? Uncertainty in ymag 136-140 F5.2 mag unfmag [16.5/18]? Unfiltered magnitude 142-145 F4.2 mag e_unfmag [0.3]? Uncertainty in unfmag 147 A1 --- Ref Reference (1)
Note (1): Reference as follows: 1 = Kelly et al. 2015ATel.7082....1K 2 = Gerke et al. 2015ATel.7069....1G 3 = Stanek et al. 2015ATel.7063....1S 4 = Margutti 2015ATel.7072....1M 5 = Goranskij et al. 2015ATel.7206....1G
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 F5.1 d Phase Phase 7- 12 F6.1 d MJD Modified Julian Date; MJD-50000 14- 21 A8 --- Tel Telescope used (LT, NOT, SAI-2.5m, SAI-6m or Keck) 23- 27 F5.2 mag Umag [19.91]? U band magnitude 29- 32 F4.2 mag e_Umag [0.21]? Uncertainty in Umag 34- 38 F5.2 mag Bmag [19/22.5]? B band magnitude 40- 43 F4.2 mag e_Bmag [0/0.6]? Uncertainty in Bmag 45- 49 F5.2 mag Vmag [17.6/21]? V band magnitude 51- 54 F4.2 mag e_Vmag [0.02/0.3]? Uncertainty in Vmag 56 A1 --- l_Rmag Limit flag on Rmag 58- 62 F5.2 mag Rmag [16.8/23]? R band magnitude 64- 67 F4.2 mag e_Rmag [0.01/0.5]? Uncertainty in Rmag 69 A1 --- l_Imag Limit flag on Imag 71- 75 F5.2 mag Imag [16.3/25]? I band magnitude 77- 80 F4.2 mag e_Imag [0.03/0.2]? Uncertainty in Imag 82- 86 F5.2 mag gmag [19/22.2]? SDSS g band magnitude 88- 91 F4.2 mag e_gmag [0.06/0.4]? Uncertainty in gmag 93- 97 F5.2 mag rmag [17.7/23.5]? SDSS r band magnitude 99-102 F4.2 mag e_rmag [0.03/0.6]? Uncertainty in rmag 104-108 F5.2 mag imag [17.2/21.8]? SDSS i band magnitude 110-113 F4.2 mag e_imag [0.02/0.3]? Uncertainty in imag 115-119 F5.2 mag zmag [16.8/19.7]? SDSS z band magnitude 121-124 F4.2 mag e_zmag [0.01/0.07]? Uncertainty in zmag 126 A1 --- Ref Reference (1)
Note (1): Reference as follows: 1 = Goranskij et al. 2015ATel.7206....1G 2 = Goranskij et al. 2016ATel.8599....1G
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 F7.1 d Phase Phase 9- 14 F6.1 d MJD Modified Julian Date; MJD-50000 16- 21 A6 --- Tel Telescope used (PTFP48 or PTFP60) 23- 27 F5.2 mag gmag [18.4/20.9]? The g band magnitude 29- 32 F4.2 mag e_gmag [0.01/0.2]? Uncertainty in gmag 34- 38 F5.2 mag rmag [16.6/20.5]? The r band magnitude 40- 43 F4.2 mag e_rmag [0.03/0.4]? Uncertainty in rmag 45- 49 F5.2 mag imag [16.6/20.6]? The i band magnitude 51- 54 F4.2 mag e_imag [0.01/0.2]? Uncertainty in imag
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Jul-2017
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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