Search Publications
Hα and He I absorption in HAT-P-32 b observed with CARMENES. Detection of Roche lobe overflow and mass loss
Schmitt, J. H. M. M.; López-Puertas, M.; Nagel, E. +22 more
We analyze two high-resolution spectral transit time series of the hot Jupiter HAT-P-32 b obtained with the CARMENES spectrograph. Our new XMM-Newton X-ray observations of the system show that the fast-rotating F-type host star exhibits a high X-ray luminosity of 2.3 × 1029 erg s−1 (5-100 Å), corresponding to a flux of 6.9 × …
New limits from microlensing on Galactic black holes in the mass range 10 M⊙ < M < 1000 M⊙
Perdereau, O.; Aubourg, E.; Goldman, B. +17 more
We searched for long-duration microlensing events originating from intermediate-mass black holes (BH) in the halo of the Milky Way, using archival data from the EROS-2 and MACHO photometric surveys towards the Large Magellanic Cloud (LMC). We combined data from these two surveys to create a common database of light curves for 14.1 million objects …
Asteroid taxonomy from cluster analysis of spectrometry and albedo
Carry, B.; Mahlke, M.; Mattei, P. -A.
Context. The classification of the minor bodies of the Solar System based on observables has been continuously developed and iterated over the past 40 yr. While prior iterations followed either the availability of large observational campaigns or new instrumental capabilities opening new observational dimensions, we see the opportunity to improve …
A major asymmetric ice trap in a planet-forming disk. III. First detection of dimethyl ether
Booth, Alice S.; van Dishoeck, Ewine F.; Nazari, Pooneh +3 more
The complex organic molecules (COMs) detected in star-forming regions are the precursors of the prebiotic molecules that can lead to the emergence of life. By studying COMs in more evolved protoplanetary disks we can gain a better understanding of how they are incorporated into planets. This paper presents ALMA band 7 observations of the dust and …
Distance estimates for AGB stars from parallax measurements
De Beck, E.; Ramstedt, S.; Vlemmings, W. H. T. +1 more
Context. Estimating the distances to asymptotic giant branch (AGB) stars using optical measurements of their parallaxes is not straightforward because of the large uncertainties introduced by their dusty envelopes, their large angular sizes, and their surface brightness variability.
Aims: This paper aims to assess the reliability of the dista…
The X-shooter Spectral Library (XSL): Data Release 3
Peletier, R. F.; Arentsen, A.; Coelho, P. R. T. +12 more
We present the third data release (DR3) of the X-shooter Spectral Library (XSL). This moderate-to-high resolution, near-ultraviolet-to-near-infrared (350-2480 nm, R ∼ 10 000) spectral library is composed of 830 stellar spectra of 683 stars. DR3 improves upon the previous data release by providing the combined de-reddened spectra of the three X-sho…
Inference of the cosmic rest-frame from supernovae Ia
Horstmann, Nick; Pietschke, Yannic; Schwarz, Dominik J.
We determine the proper motion of the Solar System from the Pantheon sample of type Ia supernovae (SNe). The posterior distribution of the Solar System proper velocity, its direction, and relevant cosmological parameters were obtained based on the observed distance moduli, heliocentric redshifts, and positions of SNe by means of a Markov chain Mon…
An estimation of the Gaia EDR3 parallax bias from stellar clusters and Magellanic Clouds data
Maíz Apellániz, J.
Context. The early-third Gaia data release (EDR3) parallaxes constitute the most detailed and accurate dataset that currently can be used to determine stellar distances in the solar neighborhood. Nevertheless, there is still room for improvement in their calibration and systematic effects can be further reduced in some circumstances.
Aims: Th…
A high angular resolution view of the PAH emission in Seyfert galaxies using JWST/MRS data
Rigopoulou, D.; García-Burillo, S.; Shimizu, T. +16 more
Polycyclic aromatic hydrocarbons (PAHs) are carbon-based molecules that are ubiquitous in a variety of astrophysical objects and environments. In this work we use JWST/MIRI MRS spectroscopy of three Seyferts to compare their nuclear PAH emission with that of star-forming (SF) regions. This study represents the first of its kind to use sub-arcsecon…
The population of hot subdwarf stars studied with Gaia. IV. Catalogues of hot subluminous stars based on Gaia EDR3
Geier, S.; Pelisoli, I.; Culpan, R. +3 more
In light of substantial new discoveries of hot subdwarfs by ongoing spectroscopic surveys and the availability of the Gaia mission Early Data Release 3 (EDR3), we compiled new releases of two catalogues of hot subluminous stars: The data release 3 (DR3) catalogue of the known hot subdwarf stars contains 6616 unique sources and provides multi-band …