The Intermediate Luminosity Optical Transient SN 2010da: The Progenitor, Eruption, and Aftermath of a Peculiar Supergiant High-mass X-Ray Binary

Citation:

Villar VA, Berger E, Chornock R, Margutti R, Laskar T, Brown PJ, Blanchard PK, Czekala I, Lunnan R, Reynolds MT. The Intermediate Luminosity Optical Transient SN 2010da: The Progenitor, Eruption, and Aftermath of a Peculiar Supergiant High-mass X-Ray Binary. The Astrophysical Journal [Internet]. 2016;830.

Date Published:

October 1, 2016

Abstract:

We present optical spectroscopy, ultraviolet-to-infrared imaging, andX-ray observations of the intermediate luminosity optical transient(ILOT) SN 2010da in NGC 300 (d = 1.86 Mpc) spanning from ‑6 to +6years relative to the time of outburst in 2010. Based on the light-curveand multi-epoch spectral energy distributions of SN 2010da, we concludethat the progenitor of SN 2010da is a ≈10–12 M yellow supergiant possibly transitioning into a blue-loop phase. Duringoutburst, SN 2010da had a peak absolute magnitude of M bol≲ ‑10.4 mag, dimmer than other ILOTs and supernova impostors.We detect multi-component hydrogen Balmer, Paschen, and Ca ii emissionlines in our high-resolution spectra, which indicate a dusty and complexcircumstellar environment. Since the 2010 eruption, the star hasbrightened by a factor of ≈5 and remains highly variable in theoptical. Furthermore, we detect SN 2010da in archival Swift and Chandraobservations as an ultraluminous X-ray source (L X ≈ 6× 1039 erg s‑1). We additionallyattribute He ii 4686 Å and coronal Fe emission lines in additionto a steady X-ray luminosity of ≈1037 ergs‑1 to the presence of a compact companion.

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