Search Publications
Vortex-like kinematic signal, spirals, and beam smearing effect in the HD 142527 disk
Pinte, C.; Ménard, F.; van der Plas, G. +8 more
Vortices are one of the most promising mechanisms to locally concentrate millimeter dust grains and allow the formation of planetesimals through gravitational collapse. The outer disk around the binary system HD 142527 is known for its large horseshoe structure with azimuthal contrasts of ~3-5 in the gas surface density and of ~50 in the dust. Usi…
A magnetic reconnection model for hot explosions in the cool atmosphere of the Sun
Ni, Lei; Chen, Yajie; Lin, Jun +2 more
Context. Ultraviolet (UV) bursts and Ellerman bombs (EBs) are transient brightenings observed in the low solar atmospheres of emerging flux regions. Magnetic reconnection is believed to be the main mechanism leading to formation of the two activities, which are usually formed far apart from each other. However, observations also led to the discove…
A search for transiting planets around hot subdwarfs. I. Methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +79 more
Context. Hot subdwarfs experienced strong mass loss on the red giant branch (RGB) and are now hot and small He-burning objects. These stars constitute excellent opportunities for addressing the question of the evolution of exoplanetary systems directly after the RGB phase of evolution.
Aims: In this project we aim to perform a transit survey …
A sub-Neptune and a non-transiting Neptune-mass companion unveiled by ESPRESSO around the bright late-F dwarf HD 5278 (TOI-130)
Bouchy, F.; Rebolo, R.; Pallé, E. +45 more
Context. Transiting sub-Neptune-type planets, with radii approximately between 2 and 4 R⊕, are of particular interest as their study allows us to gain insight into the formation and evolution of a class of planets that are not found in our Solar System.
Aims: We exploit the extreme radial velocity (RV) precision of the ultra-stable…
Evolved massive stars at low-metallicity. III. A source catalog for the Large Magellanic Cloud
Yang, Ming; Bonanos, Alceste Z.; Gao, Jian +9 more
We present a clean, magnitude-limited (IRAC1 or WISE1 ≤ 15.0 mag) multiwavelength source catalog for the Large Magellanic Cloud (LMC). The catalog was built by crossmatching (1″) and deblending (3″) between the source list of Spitzer Enhanced Imaging Products and Gaia Data Release 2, with strict constraints on the Gaia astrometric solution in orde…
Studying the ISM at ∼10 pc scale in NGC 7793 with MUSE. II. Constraints on the oxygen abundance and ionising radiation escape
Della Bruna, Lorenza; Östlin, Göran; Smith, Linda J. +11 more
Context. Feedback from massive stars affects the interstellar medium (ISM) from the immediate surroundings of the stars (parsec scales) to galactic (kiloparsec) scales. High-spatial resolution studies of H II regions are critical to investigate how this mechanism operates.
Aims: We study the ionised ISM in NGC 7793 with the MUSE instrument at…
Mass and density of the transiting hot and rocky super-Earth LHS 1478 b (TOI-1640 b)
Kuzuhara, M.; Tamura, M.; Kudo, T. +52 more
One of the main objectives of the Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of small rocky planets around relatively bright nearby stars. Here, we report the discovery and characterization of the transiting super-Earth planet orbiting LHS 1478 (TOI-1640). The star is an inactive red dwarf (J ~ 9.6 mag and spectral type …
Rotation periods for cool stars in the open cluster NGC 3532. The transition from fast to slow rotation
Strassmeier, K. G.; Barnes, S. A.; James, D. J. +1 more
Context. A very rich cluster intermediate in age between the Pleiades (150 Myr) and the Hyades (600 Myr) is needed to probe the rotational evolution, especially the transition between fast and slow rotation that occurs between the two ages.
Aims: We study the rich 300 Myr-old open cluster NGC 3532 to probe this important transition and to pro…
CAPOS: The bulge Cluster APOgee Survey. I. Overview and initial ASPCAP results
Minniti, D.; Zoccali, M.; Rojas-Arriagada, A. +39 more
Context. Bulge globular clusters (BGCs) are exceptional tracers of the formation and chemodynamical evolution of this oldest Galactic component. However, until now, observational difficulties have prevented us from taking full advantage of these powerful Galactic archeological tools.
Aims: CAPOS, the bulge Cluster APOgee Survey, addresses thi…
Physical properties of brightest cluster galaxies up to redshift 1.80 based on HST data
Durret, F.; Márquez, I.; Chu, A.
Context. Brightest cluster galaxies (BCGs) grow by accreting numerous smaller galaxies, and can be used as tracers of cluster formation and evolution in the cosmic web. However, there is still controversy regarding the main epoch of formation of BCGs; some authors believe they already formed before redshift z = 2, while others find that they are s…