An unusually large gaseous transit in a debris disc
Abstract
We present the detection of an unusually large transient gas absorption in several ionized species in the debris disc star HD37306 using high-resolution optical spectra. We have been analysing a large sample of debris discs searching for circumstellar gas absorptions aiming to determine the frequency of gas in debris discs. HD37306 stood out showing remarkably broad absorptions superimposed on to several photospheric Ca II, FeII, and Ti II lines. The observed absorptions, unlike typical exocometary transits, lasted for at least eight days. Here, we analyse simultaneous spectroscopic and photometric data of the event and evaluate different scenarios that might explain the observed features. We conclude that the most likely scenario might be an exocometary break-up releasing a significant amount of gas close to the star, producing an occulting 'ring'/'torus' shape.
Más información
Título según WOS: | An unusually large gaseous transit in a debris disc |
Título según SCOPUS: | An unusually large gaseous transit in a debris disc |
Título de la Revista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
Volumen: | 490 |
Número: | 4 |
Editorial: | OXFORD UNIV PRESS |
Fecha de publicación: | 2019 |
Página de inicio: | 5218 |
Página final: | 5227 |
Idioma: | English |
DOI: |
10.1093/mnras/stz2888 |
Notas: | ISI, SCOPUS |