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Radio detection of the near-IR discovered supernova 2010P

ATel #4432; R. Herrero-Illana (Instituto de Astrofisica de Andalucia, IAA-CSIC), C. Romero-Canizales (University of Turku), M. A. Perez-Torres and A. Alberdi (IAA-CSIC), E. Kankare and S. Mattila (University of Turku), and S. D. Ryder (Australian Astronomical Observatory).
on 27 Sep 2012; 20:28 UT
Credential Certification: Miguel A. Perez-Torres (torres@iaa.es)

Subjects: Radio, Supernovae, Transient

We report the radio detection of supernova 2010P (cf. CBETs 2145, 2149) in Arp 299 in EVLA (8459 MHz) observations from 15th Jun 2011. SN2010P was discovered in near-IR images on 18th Jan 2010, and classified as a Type Ib/IIb SN based on its optical spectrum obtained on 11th Feb 2010 (cf. CBET 2189). No radio counterpart was found with MERLIN observations between 29th Jan 2010 and 1st Feb 2010 (cf. ATel 2432). The peak intensity of the EVLA detected radio counterpart is 703 +/- 60 microJy/beam, which corresponds to an approximate luminosity of 1.7 x 10^(27) erg/s/Hz at the assumed distance to Arp 299 of 44.8 Mpc, and is located at R.A. = 11h28m31s.362, Decl. = 58o33'49".35 (equinox 2000.0) within one sigma of the position reported in CBET 2145. Our radio detection at 8459 MHz ~500 days after the explosion seems to rule out a Type Ib origin for SN 2010P. Based on its radio luminosity and the optical classification, we suggest instead that the SN was a Type IIb with a slow evolution. Given that the time to reach its peak at 5 GHz should have been about 850 days (around Apr/May 2012), SN 2010P could be similar to the slowly-evolving radio supernovae detected in the nuclear region of Arp 299A (Perez-Torres et al. 2009, A&A, 507, L17). A Radio monitoring of SN 2010P is ongoing to ascertain the nature of this core-collapse supernova.