Results 51 to 60 of about 193 (77)

Exocomet orbital distribution around β Pictoris

Astronomy & Astrophysics
The ~23 Myr young star β Pictoris (β Pic) is a laboratory for planet formation studies because of its observed debris disk, its directly imaged super-Jovian planets β Pic b and c, and the evidence of extrasolar comets that regularly transit in front of the star. The most recent evidence of exocometary transits around β Pic came from stellar photometric
openaire   +3 more sources

Exocometary Science [PDF]

, 2019
This paper describes recent advances that led to the emergence of Exocometary Science, with an outlook and recommendations for the field to prospect in future decades.
Brandeker, A., Kennedy, G., Wyatt, M., Dent, W., Hughes, M., Marino, S., Matthews, B., Cataldi, G., Gaspar, A., Kral, Q., Matra, L., Oberg, K., Zuckerman, B., Kiefer, F., Wilson, P., Moor, A., Higuchi, A., Welsh, B., Wilner, D., Lyra, W., Su, K., Roberge, A., Lecavelier des Etangs, A.   +22 more
core   +1 more source

A search for transiting exocomets in TESS sectors 1–26

Monthly Notices of the Royal Astronomical Society
ABSTRACT We present a search for single photometric exocomet transits using a magnitude-limited sample of stars observed by the TESS primary mission. These events are asymmetric, with a sharp ingress and more gradual egress expected because the comet tail trails behind the coma.
Azib Norazman, Grant M Kennedy, Ann Marie Cody, Daniel Giles, Samuel Gill, Ethan Kruse   +5 more
openaire   +2 more sources

Search for exocomet transits in Kepler light curves

Astronomy & Astrophysics
Although the Kepler telescope was retired over a decade ago, it continues to offer a rich dataset for uncovering new astrophysical objects and phenomena. In this study, we conducted a comprehensive search for exocometary transit signatures within the Kepler light curves, using a machine learning approach based on a neural network trained on a library ...
P. Dumond, A. Lecavelier des Etangs, F. Kiefer, G. Hébrard, V. Caillé   +4 more
openaire   +2 more sources

Curves of growth for transiting exocomets: Application to Fe II lines in the β Pictoris system

International audienceUsing transit spectroscopy, exocomets are routinely observed in the young planetary system of β Pic. However, despite more than 35 yr of observations, we still have very little information on the physical properties and almost no ...
Hébrard, G., T. Vrignaud, Vidal-Madjar, A., F. Kiefer, A. Vidal-Madjar, A.-M. Lagrange, Vrignaud, T., G. Hébrard, Lagrange, A.-M., P. A. Strøm, Kiefer, F., Strøm, P. A., A. Lecavelier des Etangs, Lecavelier des Etangs, A.   +13 more
core   +1 more source

Two families of comets falling onto B Pictoris

, 2018
The young A6 V star β Pictoris shows variable, velocity-shifted absorptions in the Ca II H & K lines, which are attributed to infalling, evaporating, comet-like bodies (exocomets).
Tobin W, Pollard KR, Barnes SI, Persson SI   +3 more
core  

Sublimating exocomets in the PDS 70 system

Abstract Young star systems are used to study ongoing or recent planet formation processes, by observations of protoplanets, gas, and planetesimals in their disks. The young protostar PDS 70 hosts two gas giant planets and a disk containing gas and dust that is being cleared by the emerging star.
Aline Novais, Jens Hoeijmakers, Bibiana Prinoth, Alexandra Murphy, Anders Johansen, Klaudia Jaworska, Luan Ghezzi   +6 more
openaire   +1 more source

Detection of a repeated transit signature in the light curve of the enigma star KIC 8462852: A possible 928-day period

, 2017
As revealed by its peculiar Kepler light curve, the enigmatic star KIC 8462852 undergoes short and deep flux dimmings at a priori unrelated epochs. This star presents nonetheless all other characteristics of a quiet 1 Gyr old F3V star.
Hébrard, G., Vidal-Madjar, A., F. Kiefer, A. Vidal-Madjar, Wilson, P.A., A. Lecavelier des Étangs, G. Hébrard, V. Bourrier, Bourrier, V., Kiefer, F., Wilson, P. A., P. A. Wilson, Lecavelier Des Étangs, A.   +12 more
core   +1 more source

Fe I in the β Pictoris circumstellar gas disk II. time variations in the circumstellar iron gas

, 2019
10 pages, 8 figures, 8 tablesInternational audienceThe young planetary system β Pictoris is surrounded by a debris disk of dust and gas. The gas source of this disk could be exocomets (or “falling and evaporating bodies”, FEBs), which produce refractory ...
Hébrard, G., Ehrenreich, D., A. Vidal-Madjar, Kiefer, Flavien, Bourrier, V., Etangs, Alain Lecavelier des, Ferlet, R., Wilson, Paul A., A, A. Lecavelier des Etangs, D. Ehrenreich, Vidal-Madjar, Alfred, P. A. Wilson, Vidal-Madjar, A., F. Kiefer, Bourrier, Vincent, Lecavelier Des Etangs, Alain, Wilson, Paul A.,, R. Ferlet, G. Hébrard, V. Bourrier, Ehrenreich, David, Ferlet, Roger, Kiefer, F., Hebrard, Guillaume, Wilson, P. A., Lecavelier des Etangs, A.   +25 more
core   +1 more source

Extrasolar systems shed light on our own. [PDF]

Proc Natl Acad Sci U S A, 2013
Drake N.
europepmc   +1 more source