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SN 2019ehk: A Double-peaked Ca-rich Transient with Luminous X-Ray Emission and Shock-ionized Spectral Features

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cris.lastimport.scopus2024-02-12T20:21:00Z
dc.abstract.enWe present panchromatic observations and modeling of the Calcium-rich supernova (SN) 2019ehk in the star-forming galaxy M100 (d ≍ 16.2 Mpc) starting 10 hr after explosion and continuing for ˜300 days. SN 2019ehk shows a double-peaked optical light curve peaking at t = 3 and 15 days. The first peak is coincident with luminous, rapidly decaying Swift-XRT-discovered X-ray emission ( ${L}_{{\rm{x}}}\approx {10}^{41}\,\mathrm{erg}\,{{\rm{s}}}^{-1}$ at 3 days; L<SUB>x</SUB> ∝ t<SUP>-3</SUP>), and a Shane/Kast spectral detection of narrow Hα and He II emission lines (v ≍ 500 $\mathrm{km}\,{{\rm{s}}}^{-1}$ ) originating from pre-existent circumstellar material (CSM). We attribute this phenomenology to radiation from shock interaction with extended, dense material surrounding the progenitor star at r < 10<SUP>15</SUP> cm and the resulting cooling emission. We calculate a total CSM mass of ˜7 × 10<SUP>-3</SUP> ${M}_{\odot }$ (M<SUB>He</SUB>/M<SUB>H</SUB> ≍6) with particle density n ≍ 10<SUP>9</SUP> cm<SUP>-3</SUP>. Radio observations indicate a significantly lower density n < 10<SUP>4</SUP> cm<SUP>-3</SUP> at larger radii r > (0.1-1) × 10<SUP>17</SUP> cm. The photometric and spectroscopic properties during the second light-curve peak are consistent with those of Ca-rich transients (rise-time of t<SUB>r</SUB> = 13.4 ± 0.210 days and a peak B-band magnitude of M<SUB>B</SUB> = -15.1 ± 0.200 mag). We find that SN 2019ehk synthesized (3.1 ± 0.11) × 10<SUP>-2</SUP> ${M}_{\odot }$ of ${}^{56}\mathrm{Ni}$ and ejected M<SUB>ej</SUB> = (0.72 ± 0.040) ${M}_{\odot }$ total with a kinetic energy E<SUB>k</SUB> = (1.8 ± 0.10) × 10<SUP>50</SUP> erg. Finally, deep HST pre-explosion imaging at the SN site constrains the parameter space of viable stellar progenitors to massive stars in the lowest mass bin (˜10 ${M}_{\odot }$ ) in binaries that lost most of their He envelope or white dwarfs (WDs). The explosion and environment properties of SN 2019ehk further restrict the potential WD progenitor systems to low-mass hybrid HeCO WD+CO WD binaries.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorJacobson-Galán, Wynn V.
dc.contributor.authorMargutti, Raffaella
dc.contributor.authorKilpatrick, Charles D.
dc.contributor.authorHiramatsu, Daichi
dc.contributor.authorPerets, Hagai
dc.contributor.authorKhatami, David
dc.contributor.authorFoley, Ryan J.
dc.contributor.authorRaymond, John
dc.contributor.authorYoon, Sung-Chul
dc.contributor.authorBobrick, Alexey
dc.contributor.authorZenati, Yossef
dc.contributor.authorGalbany, Lluís
dc.contributor.authorAndrews, Jennifer
dc.contributor.authorBrown, Peter J.
dc.contributor.authorCartier, Régis
dc.contributor.authorCoppejans, Deanne L.
dc.contributor.authorDimitriadis, Georgios
dc.contributor.authorDobson, Matthew
dc.contributor.authorHajela, Aprajita
dc.contributor.authorHowell, D. Andrew
dc.contributor.authorKuncarayakti, Hanindyo
dc.contributor.authorMilisavljevic, Danny
dc.contributor.authorRahman, Mohammed
dc.contributor.authorRojas-Bravo, César
dc.contributor.authorSand, David J.
dc.contributor.authorShepherd, Joel
dc.contributor.authorSmartt, Stephen J.
dc.contributor.authorStacey, Holland
dc.contributor.authorStroh, Michael
dc.contributor.authorSwift, Jonathan J.
dc.contributor.authorTerreran, Giacomo
dc.contributor.authorVinko, Jozsef
dc.contributor.authorWang, Xiaofeng
dc.contributor.authorAnderson, Joseph P.
dc.contributor.authorBaron, Edward A.
dc.contributor.authorBerger, Edo
dc.contributor.authorBlanchard, Peter K.
dc.contributor.authorBurke, Jamison
dc.contributor.authorCoulter, David A.
dc.contributor.authorDeMarchi, Lindsay
dc.contributor.authorDerKacy, James M.
dc.contributor.authorFremling, Christoffer
dc.contributor.authorGomez, Sebastian
dc.contributor.authorHosseinzadeh, Griffin
dc.contributor.authorKasen, Daniel
dc.contributor.authorKriskovics, Levente
dc.contributor.authorMcCully, Curtis
dc.contributor.authorMüller-Bravo, Tomás E.
dc.contributor.authorNicholl, Matt
dc.contributor.authorOrdasi, András
dc.contributor.authorPellegrino, Craig
dc.contributor.authorPiro, Anthony L.
dc.contributor.authorPál, András
dc.contributor.authorRen, Juanjuan
dc.contributor.authorRest, Armin
dc.contributor.authorRich, R. Michael
dc.contributor.authorSai, Hanna
dc.contributor.authorSárneczky, Krisztián
dc.contributor.authorShen, Ken J.
dc.contributor.authorShort, Philip
dc.contributor.authorSiebert, Matthew R.
dc.contributor.authorStauffer, Candice
dc.contributor.authorSzakáts, Róbert
dc.contributor.authorZhang, Xinhan
dc.contributor.authorZhang, Jujia
dc.contributor.authorZhang, Kaicheng
dc.date.accessioned2024-01-26T07:50:49Z
dc.date.available2024-01-26T07:50:49Z
dc.date.copyright2020-05-04
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume898
dc.identifier.doi10.3847/1538-4357/AB9E66
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120068
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020ApJ...898..166J
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages166
dc.rightsOther
dc.sciencecloudnosend
dc.titleSN 2019ehk: A Double-peaked Ca-rich Transient with Luminous X-Ray Emission and Shock-ionized Spectral Features
dc.typeJournalArticle
dspace.entity.typePublication