SN 2022oqm: A Bright and Multi-peaked Calcium-rich Transient
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| Format: | Preprint |
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2023
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| 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 |
| author_facet | 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 |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_12991 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | SN 2022oqm: A Bright and Multi-peaked Calcium-rich Transient 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 High Energy Astrophysical Phenomena 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. |
| title | SN 2022oqm: A Bright and Multi-peaked Calcium-rich Transient |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2308.12991 |