Exocomet signatures around the A-shell star φ Leonis?
(2016) In Astronomy and Astrophysics 594.- Abstract
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... (More)
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.
(Less)
- author
- organization
- publishing date
- 2016-10-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Circumstellar matter, Comets: general, Planetary systems, Stars: individual: φLeo
- in
- Astronomy and Astrophysics
- volume
- 594
- article number
- L1
- publisher
- EDP Sciences
- external identifiers
-
- wos:000385832200125
- scopus:84991227111
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/201629514
- language
- English
- LU publication?
- yes
- id
- 07a90a88-24ae-42eb-a76b-54b50ac4c755
- date added to LUP
- 2016-11-02 11:26:29
- date last changed
- 2024-09-07 00:52:23
@article{07a90a88-24ae-42eb-a76b-54b50ac4c755, abstract = {{<p>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.</p>}}, author = {{Eiroa, C. and Rebollido, I. and Montesinos, B. and Villaver, E. and Absil, O. and Henning, Th and Bayo, A. and Canovas, H. and Carmona, A. and Chen, Ch and Ertel, S. and Iglesias, D. P. and Launhardt, R. and Maldonado, J. and Meeus, G. and Moór, A. and Mora, A. and Mustill, A. J. and Olofsson, J. and Riviere-Marichalar, P. and Roberge, A.}}, issn = {{0004-6361}}, keywords = {{Circumstellar matter; Comets: general; Planetary systems; Stars: individual: φLeo}}, language = {{eng}}, month = {{10}}, publisher = {{EDP Sciences}}, series = {{Astronomy and Astrophysics}}, title = {{Exocomet signatures around the A-shell star φ Leonis?}}, url = {{http://dx.doi.org/10.1051/0004-6361/201629514}}, doi = {{10.1051/0004-6361/201629514}}, volume = {{594}}, year = {{2016}}, }