AT 2020hat and AT 2020kog light curves Virtual Observatory Resource

Authors
  1. Pastorello A.
  2. Valerin G.
  3. Fraser M.
  4. Elias-Rosa N.
  5. Valenti S.,Reguitti A.
  6. Mazzali P.A.
  7. Amaro R.C.
  8. Andrews J.E.
  9. Dong Y.
  10. Jencson J.,Lundquist M.
  11. Reichart D.E.
  12. Sand D.J.
  13. Wyatt S.
  14. Smartt S.J.
  15. Smith K.W.,Srivastav S.
  16. Cai Y.-Z.
  17. Cappellaro E.
  18. Holmbo S.
  19. Fiore A.
  20. Jones D.,Kankare E.
  21. Karamehmetoglu E.
  22. Lundqvist P.
  23. Morales-Garoffolo A.,Reynolds T.M.
  24. Stritzinger M.D.
  25. Williams S.C.
  26. Chambers K.C.,de Boer T.J.L.
  27. Huber M.E.
  28. Rest A.
  29. Wainscoat R.
  30. Published by
    CDS
Abstract

We present the results of our monitoring campaigns of the luminous red novae (LRNe) AT 2020hat in NGC 5068 and AT 2020kog in NGC 6106. The two objects were imaged (and detected) before their discovery by routine survey operations. They show a general trend of slow luminosity rise lasting at least a few months. The subsequent major LRN outbursts were extensively followed in photometry and spectroscopy. The light curves present an initial short-duration peak, followed by a redder plateau phase. AT 2020kog is a moderately luminous event peaking at ~7x10^40^erg/s, while AT 2020hat is almost one order of magnitude fainter than AT 2020kog, although it is still more luminous than V838 Mon. In analogy with other LRNe, the spectra of AT 2020kog change significantly with time. They resemble those of type IIn supernovae at early phases, then they become similar to those of K-type stars during the plateau, and to M-type stars at very late phases. In contrast, AT 2020hat already shows a redder continuum at early epochs, and its spectrum shows the late appearance of molecular bands. A moderate-resolution spectrum of AT 2020hat taken at +37d after maximum shows a forest of narrow P Cygni lines of metals with velocities of 180 km/s, along with an Halpha emission with a full-width at half-maximum velocity of 250km/s. For AT 2020hat, a robust constraint on its quiescent progenitor is provided by archival images of the Hubble Space Telescope. The progenitor is clearly detected as a mid-K type star, with an absolute magnitude of M_F606W=-3.33+/-0.09mag and a colour of F606W-F814W=1.14+/-0.05mag, which are inconsistent with the expectations from a massive star that could later produce a core-collapse supernova. Although quite peculiar, the two objects nicely match the progenitor versus light curve absolute magnitude correlations discussed in the literature.

Keywords
  1. orbits
  2. stellar-mass-loss
  3. visible-astronomy
  4. Wide-band photometry
  5. infrared-photometry
  6. hst-photometry
  7. spectroscopy
Bibliographic source Bibcode
2021A&A...647A..93P
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/647/A93
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/647/A93
Document Object Identifer DOI
doi:10.26093/cds/vizier.36470093

Access

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/647/A93
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History

2021-03-12T07:59:19Z
Resource record created
2021-03-12T07:59:19Z
Created
2021-07-05T08:36:35Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr