Strong Carbon Features and a Red Early Color in the Underluminous Type Ia SN 2022xkq
-
Published:2023-12-19
Issue:1
Volume:960
Page:29
-
ISSN:0004-637X
-
Container-title:The Astrophysical Journal
-
language:
-
Short-container-title:ApJ
Author:
Pearson JeniveveORCID, Sand David J.ORCID, Lundqvist PeterORCID, Galbany LluísORCID, Andrews Jennifer E.ORCID, Bostroem K. AzaleeORCID, Dong 董 Yize 一泽ORCID, Hoang EmilyORCID, Hosseinzadeh GriffinORCID, Janzen DarylORCID, Jencson Jacob E.ORCID, Lundquist Michael J.ORCID, Mehta Darshana, Meza Retamal NicolásORCID, Shrestha ManishaORCID, Valenti StefanoORCID, Wyatt SamuelORCID, Anderson Joseph P.ORCID, Ashall ChrisORCID, Auchettl KatieORCID, Baron EddieORCID, Blondin StéphaneORCID, Burns Christopher R.ORCID, Cai 蔡 Yongzhi 永志ORCID, Chen Ting-WanORCID, Chomiuk LauraORCID, Coulter David A.ORCID, Cross Dane, Davis Kyle W.ORCID, de Jaeger ThomasORCID, DerKacy James M.ORCID, Desai Dhvanil D.ORCID, Dimitriadis GeorgiosORCID, Do AaronORCID, Farah Joseph R.ORCID, Foley Ryan J.ORCID, Gromadzki MariuszORCID, Gutiérrez Claudia P.ORCID, Haislip JoshuaORCID, González Hernández Jonay I.ORCID, Hinkle Jason T.ORCID, Hoogendam Willem B.ORCID, Howell D. AndrewORCID, Hoeflich PeterORCID, Hsiao EricORCID, Huber Mark E.ORCID, Jha Saurabh W.ORCID, Jiménez Palau CristinaORCID, Kilpatrick Charles D.ORCID, Kouprianov VladimirORCID, Kumar SahanaORCID, Kwok Lindsey A.ORCID, Larison ConorORCID, LeBaron NatalieORCID, Le Saux XavierORCID, Lu JingORCID, McCully CurtisORCID, Mera Evans TychoORCID, Milne PeterORCID, Modjaz MaryamORCID, Morrell NidiaORCID, Müller-Bravo Tomás E.ORCID, Newsome MeganORCID, Nicholl MattORCID, Padilla Gonzalez EstefaniaORCID, Payne Anna V.ORCID, Pellegrino CraigORCID, Phan KimORCID, Pineda-García JonathanORCID, Piro Anthony L.ORCID, Piscarreta LaraORCID, Polin AbigailORCID, Reichart Daniel E.ORCID, Rojas-Bravo CésarORCID, Ryder Stuart D.ORCID, Salmaso IreneORCID, Schwab MichaelaORCID, Shahbandeh MelissaORCID, Shappee Benjamin J.ORCID, Siebert Matthew R.ORCID, Smith NathanORCID, Strader JayORCID, Taggart KirstyORCID, Terreran GiacomoORCID, Tinyanont SamapornORCID, Tucker M. A.ORCID, Valerin GiorgioORCID, Young D. R.ORCID
Abstract
Abstract
We present optical, infrared, ultraviolet, and radio observations of SN 2022xkq, an underluminous fast-declining Type Ia supernova (SN Ia) in NGC 1784 (D ≈ 31 Mpc), from <1 to 180 days after explosion. The high-cadence observations of SN 2022xkq, a photometrically transitional and spectroscopically 91bg-like SN Ia, cover the first days and weeks following explosion, which are critical to distinguishing between explosion scenarios. The early light curve of SN 2022xkq has a red early color and exhibits a flux excess that is more prominent in redder bands; this is the first time such a feature has been seen in a transitional/91bg-like SN Ia. We also present 92 optical and 19 near-infrared (NIR) spectra, beginning 0.4 days after explosion in the optical and 2.6 days after explosion in the NIR. SN 2022xkq exhibits a long-lived C i 1.0693 μm feature that persists until 5 days post-maximum. We also detect C ii
λ6580 in the pre-maximum optical spectra. These lines are evidence for unburnt carbon that is difficult to reconcile with the double detonation of a sub-Chandrasekhar mass white dwarf. No existing explosion model can fully explain the photometric and spectroscopic data set of SN 2022xkq, but the considerable breadth of the observations is ideal for furthering our understanding of the processes that produce faint SNe Ia.
Funder
National Science Foundation Heising-Simons Foundation Ministerio de Ciencia e Innovación EC ∣ EU Social ∣ European Social Fund MEC ∣ Consejo Superior de Investigaciones Científicas
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
|
|