Search Publications
Missions
Journals
Publication Years
Influence of Collisions with Hydrogen on Titanium Abundance Determinations in Cool Stars
Sitnova, T. M.; Yakovleva, S. A.; Belyaev, A. K. +1 more
The possibility of solving the problem of a discrepancy in the non-LTE abundances from Ti I and Ti II lines in metal-poor stars is investigated by applying accurate data to take into account the collisions with hydrogen atoms. For this purpose, we have calculated for the first time the rate coefficients for bound-bound transitions in inelastic col…
The long-term enhanced brightness of the magnetar 1E 1547.0-5408
Enoto, Teruaki; Esposito, Paolo; Rea, Nanda +6 more
We present the evolution of the X-ray emission properties of the magnetar 1E 1547.0-5408 since February 2004 over a time period covering three outbursts. We analyzed new and archival observations taken with the Swift, NuSTAR, Chandra, and XMM-Newton X-ray satellites. The source has been observed at a relatively steady soft X-ray flux of ≈10-1…
Phase-curve Pollution of Exoplanet Transit Depths
Lagage, Pierre-Olivier; Morello, Giuseppe; Cossou, Christophe +2 more
The next generation of space telescopes will enable transformative science to understand the nature and origin of exoplanets. In particular, transit spectroscopy will reveal the chemical composition of the exoplanet atmospheres with unprecedented detail thanks to precise measurements of the visible-to-infrared transit depths down to 10 parts per m…
Distance and mass of the M 104 (Sombrero) group
Anand, Gagandeep S.; Shaya, Edward J.; Karachentsev, Igor D. +3 more
Aims: Distances and radial velocities of galaxies in the vicinity of the luminous early-type galaxy M 104 (Sombrero) are used to derive its dark matter mass.
Methods: Two dwarf galaxies: UGCA 307 and KKSG 30 situated near M 104 were observed with the Advanced Camera for Surveys on the Hubble Space Telescope. The distances 9.03-0.51<…
Stellar Occultation by the Resonant Trans-Neptunian Object (523764) 2014 WC510 Reveals a Close Binary TNO
Buie, Marc W.; Wasserman, Lawrence H.; Leiva, Rodrigo +22 more
We report on the stellar occultation by (523764) 2014 WC510 observed on 2018 December 1 UT. This occultation campaign was part of the Research and Education Collaborative Occultation Network (RECON), a network of small telescopes spread over 2000 km in western USA and Canada. Light curves from six stations revealed three groups of two o…
Evidence of an evolved nature of MWC 349A
Kraus, M.; Arias, M. L.; Cidale, L. S. +1 more
The Galactic emission-line object MWC 349A is one of the brightest radio stars in the sky. The central object is embedded in an almost edge-on oriented Keplerian rotating thick disc that seems to drive a rotating bipolar wind. The dense disc is also the site of hot molecular emission such as the CO bands with its prominent band heads in the near-i…
ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT). III. The interplay between gas and dust in the protoplanetary disk of DG Tau
Podio, L.; Bacciotti, F.; Fedele, D. +9 more
Context. Planets form in protoplanetary disks and inherit their chemical composition. It is therefore crucial to understand the molecular content of protoplanetary disks in their gaseous and solid components.
Aims: We aim to characterize the distribution and abundance of molecules in the protoplanetary disk of DG Tau and to compare them with …
Detection of a Satellite of the Trojan Asteroid (3548) Eurybates—A Lucy Mission Target
Marchi, S.; Weaver, H. A.; Buie, M. W. +8 more
We describe the discovery of a satellite of the Trojan asteroid (3548) Eurybates in images obtained with the Hubble Space Telescope. The satellite was detected on three separate epochs, two in 2018 September and one in 2020 January. The satellite has a brightness in all three epochs consistent with an effective diameter of d2 = 1.2 ± 0.…
Near-perihelion activity of comet 67P/Churyumov-Gerasimenko. A first attempt of non-static analysis
Keller, H. U.; Mottola, S.; Hartogh, P. +1 more
The observed rate of water production of comet 67P/Churyumov-Gerasimenko near its perihelion can be approximated by a very steep power function of the heliocentric distance. Widely used thermophysical models based on a static dust layer on top of the icy/refractory matrix are poorly consistent with these observations. We analyse published model re…
WIYN Open Cluster Study LXXIX. M48 (NGC 2548) I. Radial Velocities, Rotational Velocities, and Metallicities of Stars in the Open Cluster M48 (NGC 2548)
Twarog, Bruce A.; Anthony-Twarog, Barbara J.; Deliyannis, Constantine P. +2 more
WIYN/Hydra spectra (R ∼ 13,500, signal-to-noise pixel-1 = 50-1000) of a 400 Å region around Li 6708 Å are used to determine radial and rotational velocities for 287 photometrically selected candidate members of the open cluster M48. The sample ranges from turnoff A stars to late-K dwarfs and eight giants. We combine our VRAD …