Results 31 to 40 of about 193 (77)
Interstellar Comets from Post-main-sequence Systems as Tracers of Extrasolar Oort Clouds
The Planetary Science Journal, 2023 Interstellar small bodies are unique probes into the histories of exoplanetary systems. One hypothesized class of interlopers are “Jurads,” exocomets released into the Milky Way during the post-main-sequence as the thermally pulsing asymptotic giant ...
W. Garrett Levine +6 more
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The Astrophysical Journal, 2023 ASASSN-21qj is a distant Sun-like star that recently began an episode of deep dimming events after no prior recorded variability. Here we examine archival and newly obtained optical and near-infrared data of this star.
Jonathan P. Marshall +8 more
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The search for exocomets in photometry using CHEOPS
, 2022 The interest in minor bodies has grown significantly in the past decade, thanks to the growth of the exoplanetary field and their relevance in planetary system formation and architecture. Particularly, the presence of exocomets has been detected in spectroscopy as variable absorption events in metallic lines (mainly Ca II K and Na D) in several A-type ...
Rebollido, I. +5 more
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Transit distances and compositions of low-velocity exocomets in the β Pic system
Astronomy & AstrophysicsBeta Pictoris is a young nearby A5V star, about 20 Myr old, that is embedded in a prominent debris disc. For the past 40 years, variable absorption features, produced by the gaseous tails of exocomets transiting the star, have been observed in the ...
Vrignaud T., Lecavelier des Etangs A.
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Exocomet signatures around the A-shell starφLeonis? [PDF]
Astronomy & Astrophysics, 2016 We present an intensive monitoring of high-resolution spectra of the Ca {\sc 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.
Eiroa, C. +20 more
openaire +5 more sources
TESS Discovers a Second System of Transiting Exocomets in the Extreme Debris Disk of RZ Psc
The Astrophysical Journal LettersWe present the Transiting Exoplanet Survey Satellite (TESS) discovery of only the second system of transiting exocomets with a sufficient number of events to measure the size distribution in the RZ Psc system, enabling comparisons with the β Pictoris and
Adalyn Gibson +11 more
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Yuti: A General-purpose Transit Simulator for Arbitrary Shaped Objects Orbiting Stars
The Astronomical JournalWe present a versatile transit simulator ( Yuti ) aimed at generating light curves for arbitrarily shaped objects transiting stars. Utilizing a Monte Carlo algorithm, it accurately models the stellar flux blocked by these objects, producing precise light
Ushasi Bhowmick, Vikram Khaire
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Preperihelion Development of Interstellar Comet 3I/ATLAS
The Astrophysical Journal LettersWe describe preperihelion optical observations of interstellar comet 3I/ATLAS taken during 2025 July–September using the Nordic Optical Telescope. Fixed aperture photometry of the comet is well described by a power-law function of heliocentric distance ...
David Jewitt, Jane Luu
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MINDS: Detection of an Inner Gas Disk Caused by Evaporating Bodies around HD 172555
The Astrophysical JournalMechanisms such as collisions of rocky bodies or cometary activity give rise to dusty debris disks. Debris disks trace the leftover building blocks of planets, and thus also planetary composition.
Matthias Samland +25 more
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High CO/H2 ratio supports an exocometary origin for a CO-rich debris disc
Astronomy & AstrophysicsContext. Over 20 exocometary belts host detectable circumstellar gas, mostly in the form of CO. Two competing theories for its origin have emerged, positing that the gas is either primordial or secondary.
Smith K. D. +11 more
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