Search Results - "Mékarnia, Djamel"
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Evidence for an additional planet in the β Pictoris system
Published in Nature astronomy (01-12-2019)“…With its imaged debris disk of dust, its evaporating exocomets, and an imaged giant planet, the young (~23 Myr) β Pictoris system is a unique proxy for…”
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TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS
Published in The Astronomical journal (01-04-2023)“…Abstract The K-type star TOI-2525 has an estimated mass of M = 0.849 − 0.033 + 0.024 M ⊙ and radius of R = 0.785 − 0.007 + 0.007 R ⊙ observed by the TESS…”
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3
Validating AU Microscopii d with Transit Timing Variations
Published in The Astronomical journal (01-12-2023)“…Abstract AU Mic is a young (22 Myr), nearby exoplanetary system that exhibits excess transit timing variations (TTVs) that cannot be accounted for by the two…”
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HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star
Published in The Astronomical journal (01-06-2023)“…Abstract We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting…”
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Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks
Published in Astrophysical journal. Letters (01-12-2023)“…Abstract The impact of the Double Asteroid Redirection Test spacecraft into Dimorphos, moon of the asteroid Didymos, changed Dimorphos’s orbit substantially,…”
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First measurements of Jupiter’s zonal winds with visible imaging spectroscopy
Published in Icarus (New York, N.Y. 1962) (01-02-2019)“…•We describe the first attempt to measure Jupiter's zonal winds with Doppler imaging spectroscopy in the visible domain•Observations were performed with a new…”
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A mid-infrared imaging catalogue of post-asymptotic giant branch stars
Published in Monthly notices of the Royal Astronomical Society (01-10-2011)“…Post-asymptotic giant branch (post-AGB) stars are key objects for the study of the dramatic morphological changes of low- to intermediate-mass stars on their…”
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A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS
Published in Monthly notices of the Royal Astronomical Society (2022)“…ABSTRACT We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in…”
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Three-dimensional Atmospheric Dynamics of Jupiter from Ground-based Doppler Imaging Spectroscopy in the Visible
Published in The planetary science journal (16-04-2024)“…We present three-dimensional (3D) maps of Jupiter’s atmospheric circulation at cloud-top level from Doppler-imaging data obtained in the visible domain with…”
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A Possible Alignment Between the Orbits of Planetary Systems and their Visual Binary Companions
Published in The Astronomical journal (01-05-2022)“…Abstract Astronomers do not have a complete picture of the effects of wide-binary companions (semimajor axes greater than 100 au) on the formation and…”
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Transit timings variations in the three-planet system: TOI-270
Published in Monthly notices of the Royal Astronomical Society (01-03-2022)“…ABSTRACT We present ground- and space-based photometric observations of TOI-270 (L231-32), a system of three transiting planets consisting of one super-Earth…”
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TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
Published in Monthly notices of the Royal Astronomical Society (2023)“…ABSTRACT We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright (T…”
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TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS ∗ Based on observations collected at the European Organization for Astronomical Research in the Southern Hemisphere under MPG program 0104.A-9007. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile
Published in The Astronomical journal (28-03-2023)Get full text
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A mid-infrared imaging catalogue of post-asymptotic giant branch stars: Mid-infrared imaging of post-AGB stars
Published in Monthly notices of the Royal Astronomical Society (11-10-2011)Get full text
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15
HD 28109 Hosts A Trio of Transiting Neptunian Planets Including A Near-Resonant Pair, Confirmed By ASTEP From Antarctica
Published in Monthly notices of the Royal Astronomical Society (22-07-2022)“…We report on the discovery and characterization of three planets orbiting the F8 star HD 28109, which sits comfortably in TESS ’s continuous viewing zone. The…”
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Small body harvest with the Antarctic Search for Transiting Exoplanets (ASTEP) project
Published 25-09-2023“…Small Solar system bodies serve as pristine records that have been minimally altered since their formation. Their observations provide valuable information…”
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Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815
Published 28-01-2024“…We present the discovery and characterization of two warm mini-Neptunes transiting the K3V star TOI-815 in a K-M binary system. Analysis of the spectra and…”
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Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS
Published 11-05-2023“…A&A 675, A39 (2023) While the sample of confirmed exoplanets continues to increase, the population of transiting exoplanets around early-type stars is still…”
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HIP 33609 b: An Eccentric Brown Dwarf Transiting a V=7.3 Rapidly Rotating B-Star
Published 23-01-2023“…We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting Exoplanet…”
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TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
Published 15-08-2022“…We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright ($T = 8.5$…”
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