تقرير
Multi-Wavelength Observations of Supernova 2011ei: Time-Dependent Classification of Type IIb and Ib Supernovae and Implications for their Progenitors
| العنوان: | Multi-Wavelength Observations of Supernova 2011ei: Time-Dependent Classification of Type IIb and Ib Supernovae and Implications for their Progenitors |
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| المؤلفون: | Milisavljevic, D., Margutti, R., Soderberg, A. M., Pignata, G., Chomiuk, L., Fesen, R., Bufano, F., Sanders, N. E., Parrent, J. T., Parker, S., Mazzali, P., Pian, E., Pickering, T., Buckley, D., Crawford, S., Gulbis, A. A. M., Hettlage, C., Hooper, E., Nordsieck, K., O'Donoghue, D., Husser, T. -O., Potter, S., Kniazev, A., Kotze, P., Romero-Colmenero, E., Vaisanen, P., Wolf, M., Bietenholz, M., Bartel, N., Fransson, C., Walker, E. S., Brunthaler, A., Chakraborti, S., Levesque, E. M., MacFadyen, A., Drescher, C., Bock, G., Marples, P., Anderson, J. P., Benetti, S., Reichart, D., Ivarsen, K. |
| سنة النشر: | 2012 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | We present X-ray, UV/optical, and radio observations of the stripped-envelope, core-collapse supernova (SN) 2011ei, one of the least luminous SNe IIb or Ib observed to date. Our observations begin with a discovery within 1 day of explosion and span several months afterward. Early optical spectra exhibit broad, Type II-like hydrogen Balmer profiles that subside rapidly and are replaced by Type Ib-like He-rich features on the timescale of one week. High-cadence monitoring of this transition suggests that absorption attributable to a high velocity (> 12,000 km/s) H-rich shell is not rare in Type Ib events. Radio observations imply a shock velocity of v = 0.13c and a progenitor star mass-loss rate of 1.4 x 10^{-5} Msun yr^{-1} (assuming wind velocity v_w=10^3 km/s). This is consistent with independent constraints from deep X-ray observations with Swift-XRT and Chandra. Overall, the multi-wavelength properties of SN 2011ei are consistent with the explosion of a lower-mass (3-4 Msun), compact (R* <= 1x10^{11} cm), He core star. The star retained a thin hydrogen envelope at the time of explosion, and was embedded in an inhomogeneous circumstellar wind suggestive of modest episodic mass-loss. We conclude that SN 2011ei's rapid spectral metamorphosis is indicative of time-dependent classifications that bias estimates of explosion rates for Type IIb and Ib objects, and that important information about a progenitor star's evolutionary state and mass-loss immediately prior to SN explosion can be inferred from timely multi-wavelength observations. Comment: 20 pages, 19 figures, accepted for publication in the Astrophysical Journal |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0004-637X/767/1/71 |
| الوصول الحر: | http://arxiv.org/abs/1207.2152Test |
| رقم الانضمام: | edsarx.1207.2152 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0004-637X/767/1/71 |
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