Search Publications
The extremely high albedo of LTT 9779 b revealed by CHEOPS. An ultrahot Neptune with a highly metallic atmosphere
Deleuil, M.; Scandariato, G.; Hoyer, S. +11 more
Context. Optical secondary eclipse measurements of small planets can provide a wealth of information about the reflective properties of these worlds, but the measurements are particularly challenging to attain because of their relatively shallow depth. If such signals can be detected and modeled, however, they can provide planetary albedos, therma…
First results from the Solar Orbiter Heavy Ion Sensor
Fedorov, A.; Livi, S.; Wurz, P. +30 more
Aims: Solar Orbiter launched in February 2020 with the goal of revealing the connections between the Sun's interior, atmosphere, and the heliosphere. The Solar Orbiter Heavy Ion Sensor (HIS) is a time-of-flight ion mass spectrometer dedicated to measuring heavy ions in the solar wind.
Methods: We present an overview of the first measurem…
Protoplanetary disks in Ks-band total intensity and polarized light
Ren, Bin B.; Ménard, François; Bae, Jaehan +11 more
Context. The diverse morphology among protoplanetary disks may result from planet-disk interactions, suggesting the presence of planets undergoing formation. The characterization of disks can provide information on the formation environments of planets. To date, most imaging campaigns have probed the polarized light from disks, which is only a fra…
A kinematically detected planet candidate in a transition disk
Testi, L.; Ansdell, M.; Facchini, S. +10 more
Context. Transition disks are protoplanetary disks with inner cavities possibly cleared by massive companions. Observing them at high resolution is ideal for mapping their velocity structure and probing companion-disk interactions.
Aims: We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 dust and gas observations of the tra…
Planetary system around LTT 1445A unveiled by ESPRESSO: Multiple planets in a triple M-dwarf system
Bouchy, F.; Rebolo, R.; Allende Prieto, C. +32 more
We present radial velocity follow-up obtained with ESPRESSO of the M-type star LTT 1445A (TOI-455), for which a transiting planet b with an orbital period of 5.4 days was detected by TESS. We report the discovery of a second transiting planet (LTT 1445A c) and a third non-transiting candidate planet (LTT 1445A d) with orbital periods of 3.12 and 2…
Quantifying the energy balance between the turbulent ionised gas and young stars
Leroy, Adam K.; Meidt, Sharon E.; Glover, Simon C. O. +19 more
Context. Stellar feedback is a key contributor to the morphology and dynamics of the interstellar medium in star-forming galaxies. In particular, energy and momentum input from massive stars can drive the turbulent motions in the gas, but the dominance and efficiency of this process are unclear. The study of ionised superbubbles enables quantitati…
Mother of dragons. A massive, quiescent core in the dragon cloud (IRDC G028.37+00.07)
Bigiel, F.; Parker, R. J.; Longmore, S. N. +15 more
Context. Core accretion models of massive star formation require the existence of massive, starless cores within molecular clouds. Yet, only a small number of candidates for such truly massive, monolithic cores are currently known.
Aims: Here we analyse a massive core in the well-studied infrared-dark cloud (IRDC) called the `dragon cloud' (a…
White dwarf Random Forest classification through Gaia spectral coefficients
Rebassa-Mansergas, Alberto; Torres, Santiago; García-Zamora, Enrique Miguel
Context. The third data release of Gaia has provided approximately 220 million low resolution spectra. Among these, about 100 000 correspond to white dwarfs. The magnitude of this quantity of data precludes the possibility of performing spectral analysis and type determination by human inspection. In order to tackle this issue, we explore the poss…
X-ray polarimetry of the accreting pulsar GX 301−2
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +102 more
The phase- and energy-resolved polarization measurements of accreting X-ray pulsars (XRPs) allow us to test different theoretical models of their emission, and they also provide an avenue to determine the emission region geometry. We present the results of the observations of the XRP GX 301−2 performed with the Imaging X-ray Polarimetry Explorer (…
55 Cancri e's occultation captured with CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +73 more
Past occultation and phase-curve observations of the ultra-short period super-Earth 55 Cnc e obtained at visible and infrared wavelengths have been challenging to reconcile with a planetary reflection and emission model. In this study, we analyse a set of 41 occultations obtained over a two-year timespan with the CHEOPS satellite. We report the de…