SN 2021gno: a calcium-rich transient with double-peaked light curves

Ertini K.; Folatelli G.; Martinez L.; Bersten M.C.; Anderson J.P.; Ashall C.; Baron E.; Bose S.; Brown P.J.; Burns C.; Derkacy J.M.; Ferrari L.; Galbany L.; Hsiao E.; Kumar S.; Lu J.; Mazzali P.; Morrell N.; Orellana M.; Pessi P.J.; Phillips M.M.; Piro A.L.; Polin A.; Shahbandeh M.; Shappee B.J.; Stritzinger M.; Suntzeff N.B.; Tucker M.; Elias-Rosa N.; Kuncarayakti H.; Gutiérrez C.P.; Kozyreva A.; Müller-Bravo T.E.; Chen T.W.; Hinkle J.T.; Payne A.V.; Székely P.; Szalai T.; Barna B.; Könyves-Tóth R.; Bánhidi D.; Bíró I.B.; Csányi I.; Kriskovits L.; Pál A.; Szabó Z.; Szakáts R.; Vida K.; Vinkó J.; Gromadzki M.; Harvey L.; Nicholl M.; Paraskeva E.; Young D.R.; Englert B.
SN 2021gno: a calcium-rich transient with double-peaked light curves

Ertini K.
Folatelli G.
Martinez L.
Bersten M.C.
Anderson J.P.
Ashall C.
Baron E.
Bose S.
Brown P.J.
Burns C.
Derkacy J.M.
Ferrari L.
Galbany L.
Hsiao E.
Kumar S.
Lu J.
Mazzali P.
Morrell N.
Orellana M.
Pessi P.J.
Phillips M.M.
Piro A.L.
Polin A.
Shahbandeh M.
Shappee B.J.
Stritzinger M.
Suntzeff N.B.
Tucker M.
Elias-Rosa N.
Kuncarayakti H.
Gutiérrez C.P.
Kozyreva A.
Müller-Bravo T.E.
Chen T.W.
Hinkle J.T.
Payne A.V.
Székely P.
Szalai T.
Barna B.
Könyves-Tóth R.
Bánhidi D.
Bíró I.B.
Csányi I.
Kriskovits L.
Pál A.
Szabó Z.
Szakáts R.
Vida K.
Vinkó J.
Gromadzki M.
Harvey L.
Nicholl M.
Paraskeva E.
Young D.R.
Englert B.
Katso/Avaa
Lataukset: 

Oxford University Press
doi:10.1093/mnras/stad2705
URI
https://academic.oup.com/mnras/article/526/1/279/7264874
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2025082790445
Tiivistelmä

We present extensive ultraviolet (UV) and optical photometric and optical spectroscopic follow-up of supernova (SN) 2021gno by the ‘Precision Observations of Infant Supernova Explosions’ (POISE) project, starting less than 2 d after the explosion. Given its intermediate luminosity, fast photometric evolution, and quick transition to the nebular phase with spectra dominated by [Ca ii] lines, SN 2021gno belongs to the small family of Calcium-rich transients. Moreover, it shows double-peaked light curves, a phenomenon shared with only four other Calcium-rich events. The projected distance from the centre of the host galaxy is not as large as other objects in this family. The initial optical light-curve peaks coincide with a very quick decline of the UV flux, indicating a fast initial cooling phase. Through hydrodynamical modelling of the bolometric light curve and line velocity evolution, we found that the observations are compatible with the explosion of a highly stripped massive star with an ejecta mass of 0.8 M⊙ and a 56Ni mass of 0.024 M⊙. The initial cooling phase (first light-curve peak) is explained by the presence of an extended circumstellar material comprising ∼10−2M⊙ with an extension of 1100 R⊙⁠. We discuss if hydrogen features are present in both maximum-light and nebular spectra, and their implications in terms of the proposed progenitor scenarios for Calcium-rich transients.

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