Astrophys. J., 837, 167-167 (2017/March-2)
SPIRITS 15c and SPIRITS 14buu: two obscured supernovae in the nearby star-forming galaxy IC 2163.
JENCSON J.E., KASLIWAL M.M., JOHANSSON J., CONTRERAS C., CASTELLON S., BOND H.E., MONSON A.J., MASCI F.J., CODY A.M., ANDREWS J.E., BALLY J., CAO Y., FOX O.D., GBUREK T., GEHRZ R.D., GREEN W., HELOU G., HSIAO E., MORRELL N., PHILLIPS M., PRINCE T.A., SIMCOE R.A., SMITH N., TINYANONT S. and WILLIAMS R.
Abstract (from CDS):
SPitzer InfraRed Intensive Transients Survey-SPIRITS-is an ongoing survey of nearby galaxies searching for infrared (IR) transients with Spitzer/IRAC. We present the discovery and follow-up observations of one of our most luminous (M[4.5] = -17.1 ± 0.4 mag, Vega) and reddest ([3.6] - [4.5] = 3.0 ± 0.2 mag) transients, SPIRITS 15c. The transient was detected in a dusty spiral arm of IC 2163 (D ≃ 35.5 Mpc). Pre-discovery ground-based imaging revealed an associated, shorter-duration transient in the optical and near-IR (NIR). NIR spectroscopy showed a broad (≃8400 km s–1), double-peaked emission line of He I at 1.083 µm, indicating an explosive origin. The NIR spectrum of SPIRITS 15c is similar to that of the Type IIb SN 2011dh at a phase of ≃200 days. Assuming an AV = 2.2 mag of extinction in SPIRITS 15c provides a good match between their optical light curves. The NIR light curves, however, show some minor discrepancies when compared with SN 2011dh, and the extreme [3.6]-[4.5] color has not been previously observed for any SN IIb. Another luminous (M4.5 = -16.1 ± 0.4 mag) event, SPIRITS 14buu, was serendipitously discovered in the same galaxy. The source displays an optical plateau lasting >=80 days, and we suggest a scenario similar to the low-luminosity Type IIP SN 2005cs obscured by AV ≃ 1.5 mag. Other classes of IR-luminous transients can likely be ruled out in both cases. If both events are indeed SNe, this may suggest that >=18% of nearby core-collapse SNe are missed by currently operating optical surveys.
© 2017. The American Astronomical Society. All rights reserved.
supernovae: general - supernovae: individual: (SPIRITS 15c, SPIRITS 14buu) - surveys - surveys
View the reference in ADS
To bookmark this query, right click on this link: simbad:2017ApJ...837..167J and select 'bookmark this link' or equivalent in the popup menu