Lyu Abe
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View article: TOI-2005b: An Eccentric Warm Jupiter in Spin-orbit Alignment
TOI-2005b: An Eccentric Warm Jupiter in Spin-orbit Alignment Open
We report the discovery and characterization of TOI-2005 b, a warm Jupiter on an eccentric ( e ∼ 0.59), 17.3 days orbit around a V mag = 9.867 rapidly rotating F-star. The object was detected as a candidate by Transiting Exoplanet Survey S…
View article: Cryoscope: A Cryogenic Infrared Survey Telescope in Antarctica
Cryoscope: A Cryogenic Infrared Survey Telescope in Antarctica Open
We present Cryoscope--a new 50 deg$^2$ field-of-view, 1.2 m aperture, $K_{dark}$ survey telescope to be located at Dome C, Antarctica. Cryoscope has an innovative optical-thermal design wherein the entire telescope is cryogenically cooled.…
View article: Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994
Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994 Open
We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite (TESS). TOI-4994b transits a G-type star (V = 12.6 mag) with a mass, radiu…
View article: Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach
Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach Open
Context: Among the thousands of exoplanets discovered to date, approximately a few hundred gas giants on short-period orbits are classified as ‘lonely’ and only a few are in a multi-planet system with a smaller companion on a close orbit. …
View article: TESS Hunt for Young and Maturing Exoplanets (THYME). X. A Two-planet System in the 210 Myr MELANGE-5 Association
TESS Hunt for Young and Maturing Exoplanets (THYME). X. A Two-planet System in the 210 Myr MELANGE-5 Association Open
Young (<500 Myr) planets are critical to studying how planets form and evolve. Among these young planetary systems, multiplanet configurations are particularly useful, as they provide a means to control for variables within a system. Here,…
View article: Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach
Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach Open
Context. Among the thousands of exoplanets discovered to date, approximately a few hundred gas giants on short-period orbits are classified as ‘lonely’ and only a few are in a multi-planet system with a smaller companion on a close orbit. …
View article: High contrast at small separation – III. Impact on the dark hole of MEMS deformable mirror control electronics
High contrast at small separation – III. Impact on the dark hole of MEMS deformable mirror control electronics Open
The creation of a dark hole (DH) region in the science image for exoplanet direct detection depends on deformable mirrors (DMs), where the imperfect control of DM limits the achievable contrast. The mirror surface height resolution is set …
View article: TESS Hunt for Young and Maturing Exoplanets (THYME). X. A Two-planet System in the 210 Myr MELANGE-5 Association
TESS Hunt for Young and Maturing Exoplanets (THYME). X. A Two-planet System in the 210 Myr MELANGE-5 Association Open
Young (<500 Myr) planets are critical to studying how planets form and evolve. Among these young planetary systems, multiplanet configurations are particularly useful, as they provide a means to control for variables within a system. Here,…
View article: Characteristics and performances of the small and large field adaptive optics system AOC at the C2PU telescope
Characteristics and performances of the small and large field adaptive optics system AOC at the C2PU telescope Open
International audience
View article: TESS Hunt for Young and Maturing Exoplanets (THYME) X: a two-planet system in the 210 Myr MELANGE-5 Association
TESS Hunt for Young and Maturing Exoplanets (THYME) X: a two-planet system in the 210 Myr MELANGE-5 Association Open
Young (<500 Myr) planets are critical to studying how planets form and evolve. Among these young planetary systems, multi-planet configurations are particularly useful as they provide a means to control for variables within a system. Here,…
View article: The <i>β</i> Pictoris b Hill sphere transit campaign
The <i>β</i> Pictoris b Hill sphere transit campaign Open
The β Pictoris system is the closest known stellar system with directly detected gas giant planets, an edge-on circumstellar disc, and evidence of falling sublimating bodies and transiting exocomets. The inner planet, β Pictoris c, has als…
View article: Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815
Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815 Open
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 rotation period reveal it to be a young star with an age of $200^{+400}_{-200}$Myr.…
View article: Three-dimensional Atmospheric Dynamics of Jupiter from Ground-based Doppler Imaging Spectroscopy in the Visible
Three-dimensional Atmospheric Dynamics of Jupiter from Ground-based Doppler Imaging Spectroscopy in the Visible Open
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 JIVE, the second node of the JOVIAL network, which is mounted on the Dunn Solar Te…
View article: Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815
Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815 Open
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 its spectra and rotation period reveal the star to be young, with an age of 200 −200 +400 Myr. TOI-…
View article: Surface Heterogeneity, Physical, and Shape Model of Near-Earth Asteroid (52768) 1998 OR2
Surface Heterogeneity, Physical, and Shape Model of Near-Earth Asteroid (52768) 1998 OR2 Open
On 2020 April 29, the near-Earth object (52768) 1998 OR2 experienced a close approach to Earth at a distance of 16.4 lunar distances (LD). 1998 OR2 is a potentially hazardous asteroid of absolute magnitude H = 16.04 that can currently come…
View article: Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b
Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b Open
TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 R$_J$. It orbits a low-mass pre-main sequence star (0.170 M$_\odot$, 0.56 R$_\odot$) every 27.4 days. The magneti…
View article: Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b
Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b Open
TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 R j . It orbits a low-mass pre-main sequence star (0.170 M ⊙ , 0.56 R ⊙ ) every 27.4 days. The magnetic activity …
View article: Three-dimensional atmospheric dynamics of Jupiter from ground-based Doppler imaging spectroscopy in the visible
Three-dimensional atmospheric dynamics of Jupiter from ground-based Doppler imaging spectroscopy in the visible Open
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 JIVE, the second node of the JOVIAL network, which is mounted on the Dunn Solar Te…
View article: Ready for O4 II: GRANDMA observations of <i>Swift</i> GRBs over eight weeks in spring 2022
Ready for O4 II: GRANDMA observations of <i>Swift</i> GRBs over eight weeks in spring 2022 Open
Aims. We present a campaign designed to train the Global Rapid Advanced Network Devoted to the Multi-messenger Addicts (GRANDMA) network and its infrastructure to follow up on transient alerts and detect their early afterglows. In preparat…
View article: Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks
Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks Open
The impact of the Double Asteroid Redirection Test spacecraft into Dimorphos, moon of the asteroid Didymos, changed Dimorphos’s orbit substantially, largely from the ejection of material. We present results from 12 Earth-based facilities i…
View article: Three Warm Jupiters around Solar-analog Stars Detected with TESS*
Three Warm Jupiters around Solar-analog Stars Detected with TESS* Open
We report the discovery and characterization of three giant exoplanets orbiting solar-analog stars, detected by the TESS space mission and confirmed through ground-based photometry and radial velocity measurements taken at La Silla observa…
View article: Validating AU Microscopii d with Transit Timing Variations
Validating AU Microscopii d with Transit Timing Variations Open
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 known transiting planets nor stellar activity. We present the statistical “validation” of …
View article: Ready for O4 II: GRANDMA Observations of Swift GRBs during eight-weeks of Spring 2022
Ready for O4 II: GRANDMA Observations of Swift GRBs during eight-weeks of Spring 2022 Open
We present a campaign designed to train the GRANDMA network and its infrastructure to follow up on transient alerts and detect their early afterglows. In preparation for O4 II campaign, we focused on GRB alerts as they are expected to be a…
View article: TOI-199 b: A Well-characterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica
TOI-199 b: A Well-characterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica Open
We present the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI-199 b. This planet was first identified in TESS photometry and confirmed using ground-based photometry from ASTEP in Antarctica including a…
View article: Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks
Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks Open
The impact of the DART spacecraft into Dimorphos, moon of the asteroid Didymos, changed Dimorphos' orbit substantially, largely from the ejection of material. We present results from twelve Earth-based facilities involved in a world-wide c…
View article: Close-to-fission dumbbell Jupiter-Trojan (17365) Thymbraeus
Close-to-fission dumbbell Jupiter-Trojan (17365) Thymbraeus Open
Context. Every population of small bodies in the Solar System contains a sizable fraction of multiple systems. Of these, the Jupiter Trojans have the lowest number of known binary systems and they are the least well characterized. Aims. We…
View article: TOI-199 b: A well-characterized 100-day transiting warm giant planet with TTVs seen from Antarctica
TOI-199 b: A well-characterized 100-day transiting warm giant planet with TTVs seen from Antarctica Open
We present the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI-199 b. This planet was first identified in TESS photometry and confirmed using ground-based photometry from ASTEP in Antarctica including a…
View article: Small body harvest with the Antarctic Search for Transiting Exoplanets (ASTEP) project
Small body harvest with the Antarctic Search for Transiting Exoplanets (ASTEP) project Open
Small Solar system bodies serve as pristine records that have been minimally altered since their formation. Their observations provide valuable information regarding the formation and evolution of our Solar system. Interstellar objects (IS…
View article: Small body harvest with the Antarctic Search for Transiting Exoplanets (ASTEP) project
Small body harvest with the Antarctic Search for Transiting Exoplanets (ASTEP) project Open
Small Solar system bodies serve as pristine records that have been minimally altered since their formation. Their observations provide valuable information regarding the formation and evolution of our Solar system. Interstellar objects can…
View article: TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux
TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux Open
Mature super-Earths and sub-Neptunes are predicted to be ≃ Jovian radius when younger than 10 Myr. Thus, we expect to find 5-15 R planets around young stars even if their older counterparts harbor none. We report the discovery and validati…