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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731672.0, MPI für Astronomie / Publikationen_mpia
Exocomet signatures around the A-shell star φ Leonis?
Authors:Eiroa, C.; Rebollido, I.; Montesinos, B.; Villaver, E.; Absil, O.; Henning, T.; Bayo, A.; Canovas, H.; Carmona, A.; Chen, C.; Ertel, S.; Iglesias, D. P.; Launhardt, R.; Maldonado, J.; Meeus, G.; Moór, A.; Mora, A.; Mustill, A. J.; Olofsson, J.; Riviere-Marichalar, P.; Roberge, A.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Astronomy and Astrophysics
Volume:594
Start Page:id. L1 (5 pp)
Audience:Not Specified
Abstract / Description:We present an intensive monitoring of high-resolution spectra of the Ca ii K line in the A7IV shell star φ Leo at very short (minutes, hours), short (night to night), and medium (weeks, months) timescales. The spectra show remarkable variable absorptions on timescales of hours, days, and months. The characteristics of these sporadic events are very similar to most that are observed toward the debris disk host star β Pic, which are commonly interpreted as signs of the evaporation of solid, comet-like bodies grazing or falling onto the star. Therefore, our results suggest the presence of solid bodies around φ Leo. To our knowledge, with the exception of β Pic, our monitoring has the best time resolution at the mentioned timescales for a star with events attributed to exocomets. Assuming the cometary scenario and considering the timescales of our monitoring, our results indicate that φ Leo presents the richest environment with comet-like events known to date, second only to β Pic.
Free Keywords:planetary systems; stars: individual: φLeo; comets: general; circumstellar matter
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201629514
URL:http://cdsads.u-strasbg.fr/abs/2016A%26A...594L......
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