학술논문
SN 2022oqm: A Bright and Multi-peaked Calcium-rich Transient
Document Type
Working Paper
Author
Yadavalli, S. Karthik; Villar, V. Ashley; Izzo, Luca; Zenati, Yossef; Foley, Ryan J.; Wheeler, J. Craig; Angus, Charlotte R.; Bánhidi, Dominik; Auchettl, Katie; Bíró, Barna Imre; Bódi, Attila; Bodola, Zsófia; de Boer, Thomas; Chambers, Kenneth C.; Chornock, Ryan; Coulter, David A.; Csányi, István; Cseh, Borbála; Dandu, Srujan; Davis, Kyle W.; Dickinson, Connor Braden; Farias, Diego; Farah, Joseph; Gall, Christa; Gao, Hua; Howell, D. Andrew; Jacobson-Galan, Wynn V.; Khetan, Nandita; Kilpatrick, Charles D.; Könyves-Tóth, Réka; Kriskovics, Levente; LeBaron, Natalie; Loertscher, Kayla; Saux, X. K. Le; Margutti, Rafaella; Magnier, Eugene A.; McCully, Curtis; McGill, Peter; Miao, Hao-Yu; Newsome, Megan; Gonzalez, Estefania Padilla; Pál, András; Pál, Boróka H.; Pan, Yen-Chen; Politsch, Collin A.; Ransome, Conor L.; Ramirez-Ruiz, Enrico; Rest, Armin; Rest, Sofia; Robinson, Olivia; Sears, Huei; Scheer, Jackson; Sódor, Ádám; Swift, Jonathan; Székely, Péter; Szakáts, Róbert; Szalai, Tamás; Taggart, Kirsty; Terreran, Giacomo; Venkatraman, Padma; Vinkó, József; Yang, Grace; Zhou, Henry
Source
Subject
Language
Abstract
We present the photometric and spectroscopic evolution of SN 2022oqm, a nearby multi-peaked hydrogen- and helium-weak calcium-rich transient (CaRT). SN 2022oqm was detected 13.1 kpc from its host galaxy, the face-on spiral galaxy NGC 5875. Extensive spectroscopic coverage reveals an early hot (T >= 40,000 K) continuum and carbon features observed $\sim$1~day after discovery, SN Ic-like photospheric-phase spectra, and strong forbidden calcium emission starting 38 days after discovery. SN 2022oqm has a relatively high peak luminosity (MB = -17 mag) for (CaRTs), making it an outlier in the population. We determine that three power sources are necessary to explain the light curve (LC), with each corresponding to a distinct peak. The first peak is powered by an expanding blackbody with a power law luminosity, suggesting shock cooling by circumstellar material (CSM). Subsequent LC evolution is powered by a double radioactive decay model, consistent with two sources of photons diffusing through optically thick ejecta. From the LC, we derive an ejecta mass and 56Ni mass of ~0.6 solar masses and ~0.09 solar masses. Spectroscopic modeling suggests 0.6 solar masses of ejecta, and with well-mixed Fe-peak elements throughout. We discuss several physical origins for SN 2022oqm and find either a surprisingly massive white dwarf progenitor or a peculiar stripped envelope model could explain SN 2022oqm. A stripped envelope explosion inside a dense, hydrogen- and helium-poor CSM, akin to SNe Icn, but with a large 56Ni mass and small CSM mass could explain SN 2022oqm. Alternatively, helium detonation on an unexpectedly massive white dwarf could also explain SN 2022oqm.
Comment: 35 pages, 17 figures, 7 tables, Accepted for Publication in ApJ
Comment: 35 pages, 17 figures, 7 tables, Accepted for Publication in ApJ