M101 OT2015-1
M101 OT2015-1 MlyHost Pinwheel Galaxy (M101) Peak apparent magnitude 16.5 ]
M101 OT2015-1 (also known as PSN J14021678+5426205, iPTF13afz and AT 2015dl)
Discovery
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Discovered_telescope.jpg/220px-Discovered_telescope.jpg)
M101 OT2015-1 was discovered on February 10, 2015 by Dumitru Ciprian Vîntdevară from Planetarium and Astronomical Observatory of the Museum Vasile Pârvan in Bârlad, România. The transient is located in the outer reaches of a spiral arm of M101, at 489W and 324N of the measured position of the galaxy nucleus.[5][6][7] The transient was discovered with a
The final confirmation came a year later, on 2016 January 28, from observations carried out in several astronomic observatories in Russia.[6]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Spectrum_of_the_LRN_in_M_101.jpg/310px-Spectrum_of_the_LRN_in_M_101.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/77/M101OT2015-1LightCurve.png/310px-M101OT2015-1LightCurve.png)
Observations
Date | JD 24... | B | V | R | Source |
---|---|---|---|---|---|
1993.04.15 | 49093 | - | 22.0 | - | POSS II, Kodak IIIaJ |
2003.03.07-10 | 52707 | 21.6 | 21.2 | 20.90 | SDSS, ATel 7082 |
2011.11.25 | 55891 | 20.95 | 20.95 | 21.03 | R. Pecce, Flickr.com |
2012.03.20 | 56007 | 21.74 | 21.47 | 21.13 | D. Hartmann, Astrobin |
2012.02.14-27 | 56009 | 21.34 | 21.06 | 20.63 | T. Hankock, RGB images |
2012.05.10 | 56058 | 21.12 | 21.35 | 21.30 | O. Bryzgalov, Flickr.com |
2012.05.26 | 56074 | 21.55 | 21.27 | 21.20 | O. Bryzgalov, Flickr.com |
2012.01-06 | 56109 | 21.30 | 20.97 | 20.69 | ATel 7069, LBT |
2013.02.01 | 56324 | - | - | 20.60 | ATel 7070, PTF |
2013.04 | 56360 | 20.48 | 20.50 | 20.36 | Z. Orbanic, Flickr.com |
2013.03-05 | 56398 | 20.6 | 20.4 | 20.40 | R. Pfile, Flickr.com |
2013.06.11 | 56455 | 20.95 | 20.73 | 20.30 | S. Furlong, Flickr.com |
2013.06.29 | 56473 | 21.0 | 20.5 | 20.9 | C. Frenzi, Flickr.com |
2014.06-07 | 56839 | 20.02 | 19.78 | 19.59 | ATel 7069, LBT |
2014.11.10 | 56971 | - | - | 16.36 | ATel 7070, PTF |
2014.11.13 | 56975 | - | 16.40 | - | K. Itagaki, CBAT |
2015.01.14 | 57036 | - | - | 17.50 | PTF |
2015.01.19 | 57042 | 20.20 | 18.80 | 18.23 | ATel 7069, LBT |
2015.01.20 | 57043 | - | 18.50 | - | K. Itagaki, CBAT |
2015.02.10 | 57064.4 | - | 17.50 | - | C. D. Vîntdevară, discovery |
Other information
Although the nature of the object is still debated, its resemblance with other transients from the same LRN family points towards a possible binary origin. The unusual location of the progenitor star in the Hertzsprung gap supports the hypothesis that the most massive component had expanded beyond its roche lobe, initiating the common envelope phase. The outbursts detected for M101-OT2015-1 suggest that this CE was ejected on dynamical timescales, likely leaving a surviving close binary pair. Further observations at infrared wavelengths will help to show the exact nature of the M101 OT2015-1 system.[4]
References
- ^ a b "NAME M101 OT2015-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 February 2018.
- ^ "AT 2015dl | Transient Name Server".
- ^ a b c V. P. Goranskij; E. A. Barsukova; I. Spiridonova; A. F. Valeev; T. A. Fatkhullin; A. S. Moskvitin; O. V. Vozyakova; D. V. Cheryasov; B. S. Safonov; A. V. Zharova; T. Hancock. "PSN J14021678+5426205 in the Galaxy M101 as a merger event in a massive binary system" (PDF). p. 18. Retrieved 2018-04-27.
- ^ S2CID 43063445.
- ^ a b "CBAT "Transient Object Followup Reports"". Central Bureau for Astronomical Telegrams. Retrieved 2018-04-27.
- ^ Bibcode:2016ATel.8599....1G.
- ^ "List of supernovae sorted by name for 2015". Retrieved 2018-04-27.
- Bibcode:2015ATel.7206....1G.