SN. 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION

被引：116

作者：

Marion, G. H. ^{[1
,2
]}

Brown, Peter J. ^{[3
]}

Vinko, Jozsef ^{[1
,4
]}

Silverman, Jeffrey M. ^{[1
]}

Sand, David J. ^{[5
]}

Challis, Peter ^{[2
]}

Kirshner, Robert P. ^{[2
]}

Wheeler, J. Craig ^{[1
]}

Berlind, Perry ^{[2
]}

Brown, Warren R. ^{[2
]}

Calkins, Michael L. ^{[2
]}

Camacho, Yssavo ^{[6
,7
]}

Dhungana, Govinda ^{[8
]}

Foley, Ryan J. ^{[9
,10
]}

Friedman, Andrew S. ^{[2
,11
,12
]}

Graham, Melissa L. ^{[13
]}

Howell, D. Andrew ^{[14
,15
]}

Hsiao, Eric Y. ^{[16
,17
]}

Irwin, Jonathan M. ^{[2
]}

Jha, Saurabh W. ^{[6
]}

Kehoe, Robert ^{[8
]}

Macri, Lucas M. ^{[3
]}

Maeda, Keiichi ^{[18
,21
]}

Mandel, Kaisey ^{[2
]}

McCully, Curtis ^{[14
]}

Pandya, Viraj ^{[6
,19
]}

Rines, Kenneth J. ^{[20
]}

Wilhelmy, Steven ^{[20
]}

Zheng, Weikang ^{[13
]}

机构：

[1] Univ Texas Austin, 1 Univ Stn C1400, Austin, TX 78712 USA

[2] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[3] Texas A&M Univ, Dept Phys & Astron, George P & Cynthia Woods Mitchell Inst Fundamenta, 4242 TAMU, College Stn, TX 77843 USA

[4] Univ Szeged, Dept Opt & Quantum Elect, Domter 9, H-6720 Szeged, Hungary

[5] Texas Tech Univ, Dept Phys, Lubbock, TX 79409 USA

[6] Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA

[7] Lehigh Univ, Dept Phys, 16 Mem Dr East, Bethlehem, PA 18015 USA

[8] So Methodist Univ, Dept Phys, Dallas, TX 75275 USA

[9] Univ Illinois, Dept Astron, 1002 W Green St, Urbana, IL 61801 USA

[10] Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA

[11] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[12] MIT, Dept Phys, Cambridge, MA 02139 USA

[13] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

[14] Las Cumbres Observ Global Telescope Network, 6740 Cortona Dr,Suite 102, Goleta, CA 93117 USA

[15] Univ Calif Santa Barbara, Dept Phys, Broida Hall,Mail Code 9530, Santa Barbara, CA 93106 USA

[16] Las Campanas Observ, Carnegie Observ, Casilla 601, Colina El Pino, Chile

[17] Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[18] Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan

[19] Princeton Univ, Dept Astrophys Sci, Peyton Hall, Princeton, NJ 08544 USA

[20] Western Washington Univ, Dept Phys & Astron, 516 High St, Bellingham, WA 98225 USA

[21] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 820卷 / 02期

基金：

美国国家科学基金会;

关键词：

supernovae: general; supernovae: individual (2012cg); OBSERVATORY SUPERNOVA SEARCH; HIGH-VELOCITY FEATURES; LIGHT CURVES; CIRCUMSTELLAR MATERIAL; PHOTOMETRY PROGRAM; SODIUM-ABSORPTION; PROGENITORS; ULTRAVIOLET; 2011FE; SWIFT;

D O I：

10.3847/0004-637X/820/2/92

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report evidence for excess blue light from the Type Ia supernova (Sn Ia) SN. 2012cg at 15 and 16 days before maximum B-band brightness. The emission is consistent with predictions for the impact of the supernova on a non-degenerate binary companion. This is the first evidence for emission from a companion to a normal SN. Ia. Sixteen days before maximum light, the B - V color of SN. 2012cg is 0.2 mag bluer than for other normal SN. Ia. At later times, this supernova has a typical SN. Ia light curve, with extinction-corrected MB = -19.62 +/- 0.02 mag and Delta m(15)(B)= 0.86 +/- 0.02. Our data set is extensive, with photometry in seven filters from five independent sources. Early spectra also show the effects of blue light, and high-velocity features are observed at early times. Near maximum, the spectra are normal with a silicon velocity v(Si) = -10,500 km s(-1). Comparing the early data with models by Kasen favors a main-sequence companion of about six solar masses. It is possible that many other SN Ia have main-sequence companions that have eluded detection because the emission from the impact is fleeting and faint.

引用

页数：16

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