Exocomets: A spectroscopic survey

dc.contributor.authorBayo, Amelia
dc.contributor.authorIglesias, Daniela Paz
dc.date.accessioned2021-11-19T15:19:27Z
dc.date.available2021-11-19T15:19:27Z
dc.date.issued2020
dc.description.abstractContext. While exoplanets are now routinely detected, the detection of small bodies in extrasolar systems remains challenging. Since the discovery of sporadic events interpreted as exocomets (Falling Evaporating Bodies) around Pic in the early 80s, only 20 stars have been reported to host exocomet-like events. Aims. We aim to expand the sample of known exocomet-host stars, as well as to monitor the hot-gas environment around stars with previously known exocometary activity. Methods. We have obtained high-resolution optical spectra of a heterogeneous sample of 117 main-sequence stars in the spectral type range from B8 to G8. The data have been collected in 14 observing campaigns expanding over 2 years from both hemispheres. We have analysed the Ca ii K&H and Na i D lines in order to search for non-photospheric absorptions originated in the circumstellar environment, and for variable events that could be caused by outgassing of exocomet-like bodies. Results. We have detected non-photospheric absorptions towards 50% of the sample, attributing a circumstellar origin to half of the detections (i.e. 26% of the sample). Hot circumstellar gas is detected in the metallic lines inspected via narrow stable absorptions, and/or variable blue-/red-shifted absorption events. Such variable events were found in 18 stars in the Ca ii and/or Na i lines; 6 of them are reported in the context of this work for the first time. In some cases the variations we report in the Ca ii K line are similar to those observed in Pic. While we do not find a significant trend with the age or location of the stars, we do find that the probability of finding CS gas in stars with larger v sin i is higher. We also find a weak trend with the presence of near-infrared excess, and with anomalous ( Boo-like) abundances, but this would require confirmation by expanding the sample.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201936071
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/2676
dc.language.isoenen_ES
dc.publisherEuropean Southern Observatoryen_ES
dc.sourceAstronomy & Astrophysicsen_ES
dc.subjectSTARS: GENERALen_ES
dc.subjectCOMETS: GENERALen_ES
dc.subjectKUIPER BELT: GENERALen_ES
dc.subjectISM: CLOUDSen_ES
dc.titleExocomets: A spectroscopic surveyen_ES
dc.typeArticuloen_ES
uv.catalogadorRCR DIBRAen_ES
uv.departamentoInstituto de Fisica y Astronomiaen_ES
uv.notageneralVarios autoresen_ES

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