The asymptotic evolution of the stellar merger V1309 Sco: A Blue Straggler in the making?

Thiago Ferreira, Roberto K. Saito, Dante Minniti, María Gabriela Navarro, Rodrigo Contreras Ramos, Leigh Smith, Philip W. Lucas

Resultado de la investigación: Article

Resumen

Stellar mergers are estimated to be common events in the Galaxy. The best studied stellar merger case to date is V1309 Sco (= Nova Scorpii 2008) which was originally misclassified as a Nova event. Later identified as the merger of the components of a cool overcontact binary system with 1.52 M and 0.16 M, V1309 Sco showed an initial period of P = 1.4 d before the merger. Post-outburst evolution demonstrated that V1309 Sco was unlike the typical Classical Novae and Symbiotic Recurrent Novae with significant dust production around it, and indicated that the system may become a post-AGB (or pre-PN) soon. Here we present a study of V1309 Sco about 10 yr after the outburst, based on near-IR variability and colour data from the ESO surveys VISTA Variables in the Vía Láctea (VVV) and VVV eXtended (VVVX). We find that reasonable equilibrium in this stellar merger is being reached and that the star has settled into a nearly constant magnitude. A dramatic change in its near-IR colours from (J - Ks) = 1.40 in 2010 to (J - KS) = 0.42 in 2015 and a possible low-amplitude periodic signal with P = 0.49 d in the post-outburst data are consistent with a 'blue straggler' star, predicted to be formed from a stellar merger.

Idioma originalEnglish
Páginas (desde-hasta)1220-1224
Número de páginas5
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen486
N.º1
DOI
EstadoPublished - jun 2019

Huella dactilar

novae
merger
color
blue stars
European Southern Observatory
outburst
dust
galaxies
stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Ferreira, Thiago ; Saito, Roberto K. ; Minniti, Dante ; Navarro, María Gabriela ; Ramos, Rodrigo Contreras ; Smith, Leigh ; Lucas, Philip W. / The asymptotic evolution of the stellar merger V1309 Sco : A Blue Straggler in the making?. En: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 486, N.º 1. pp. 1220-1224.
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abstract = "Stellar mergers are estimated to be common events in the Galaxy. The best studied stellar merger case to date is V1309 Sco (= Nova Scorpii 2008) which was originally misclassified as a Nova event. Later identified as the merger of the components of a cool overcontact binary system with 1.52 M and 0.16 M, V1309 Sco showed an initial period of P = 1.4 d before the merger. Post-outburst evolution demonstrated that V1309 Sco was unlike the typical Classical Novae and Symbiotic Recurrent Novae with significant dust production around it, and indicated that the system may become a post-AGB (or pre-PN) soon. Here we present a study of V1309 Sco about 10 yr after the outburst, based on near-IR variability and colour data from the ESO surveys VISTA Variables in the V{\'i}a L{\'a}ctea (VVV) and VVV eXtended (VVVX). We find that reasonable equilibrium in this stellar merger is being reached and that the star has settled into a nearly constant magnitude. A dramatic change in its near-IR colours from (J - Ks) = 1.40 in 2010 to (J - KS) = 0.42 in 2015 and a possible low-amplitude periodic signal with P = 0.49 d in the post-outburst data are consistent with a 'blue straggler' star, predicted to be formed from a stellar merger.",
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The asymptotic evolution of the stellar merger V1309 Sco : A Blue Straggler in the making? / Ferreira, Thiago; Saito, Roberto K.; Minniti, Dante; Navarro, María Gabriela; Ramos, Rodrigo Contreras; Smith, Leigh; Lucas, Philip W.

En: Monthly Notices of the Royal Astronomical Society, Vol. 486, N.º 1, 06.2019, p. 1220-1224.

Resultado de la investigación: Article

TY - JOUR

T1 - The asymptotic evolution of the stellar merger V1309 Sco

T2 - A Blue Straggler in the making?

AU - Ferreira, Thiago

AU - Saito, Roberto K.

AU - Minniti, Dante

AU - Navarro, María Gabriela

AU - Ramos, Rodrigo Contreras

AU - Smith, Leigh

AU - Lucas, Philip W.

PY - 2019/6

Y1 - 2019/6

N2 - Stellar mergers are estimated to be common events in the Galaxy. The best studied stellar merger case to date is V1309 Sco (= Nova Scorpii 2008) which was originally misclassified as a Nova event. Later identified as the merger of the components of a cool overcontact binary system with 1.52 M and 0.16 M, V1309 Sco showed an initial period of P = 1.4 d before the merger. Post-outburst evolution demonstrated that V1309 Sco was unlike the typical Classical Novae and Symbiotic Recurrent Novae with significant dust production around it, and indicated that the system may become a post-AGB (or pre-PN) soon. Here we present a study of V1309 Sco about 10 yr after the outburst, based on near-IR variability and colour data from the ESO surveys VISTA Variables in the Vía Láctea (VVV) and VVV eXtended (VVVX). We find that reasonable equilibrium in this stellar merger is being reached and that the star has settled into a nearly constant magnitude. A dramatic change in its near-IR colours from (J - Ks) = 1.40 in 2010 to (J - KS) = 0.42 in 2015 and a possible low-amplitude periodic signal with P = 0.49 d in the post-outburst data are consistent with a 'blue straggler' star, predicted to be formed from a stellar merger.

AB - Stellar mergers are estimated to be common events in the Galaxy. The best studied stellar merger case to date is V1309 Sco (= Nova Scorpii 2008) which was originally misclassified as a Nova event. Later identified as the merger of the components of a cool overcontact binary system with 1.52 M and 0.16 M, V1309 Sco showed an initial period of P = 1.4 d before the merger. Post-outburst evolution demonstrated that V1309 Sco was unlike the typical Classical Novae and Symbiotic Recurrent Novae with significant dust production around it, and indicated that the system may become a post-AGB (or pre-PN) soon. Here we present a study of V1309 Sco about 10 yr after the outburst, based on near-IR variability and colour data from the ESO surveys VISTA Variables in the Vía Láctea (VVV) and VVV eXtended (VVVX). We find that reasonable equilibrium in this stellar merger is being reached and that the star has settled into a nearly constant magnitude. A dramatic change in its near-IR colours from (J - Ks) = 1.40 in 2010 to (J - KS) = 0.42 in 2015 and a possible low-amplitude periodic signal with P = 0.49 d in the post-outburst data are consistent with a 'blue straggler' star, predicted to be formed from a stellar merger.

KW - cataclysmic variables

KW - infrared: stars

KW - surveys

KW - techniques: photometric

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U2 - 10.1093/mnras/stz878

DO - 10.1093/mnras/stz878

M3 - Article

AN - SCOPUS:85072278486

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SP - 1220

EP - 1224

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 1745-3925

IS - 1

ER -