Search Publications
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 …
Expected performances of the Characterising Exoplanet Satellite (CHEOPS). I. Photometric performances from ground-based calibration
Queloz, D.; Benz, W.; Deline, A. +6 more
Context. The characterisation of Earth-size exoplanets through transit photometry has stimulated new generations of high-precision instruments. In that respect, the Characterising Exoplanet Satellite (CHEOPS) is designed to perform photometric observations of bright stars to obtain precise radii measurements of transiting planets. The CHEOPS instr…
Nongravitational Effects of Cometary Activity
Keller, Horst Uwe; Skorov, Yuri; Mottola, Stefano +4 more
Nongravitational forces induced by sublimation of volatiles affect the rotational and orbital dynamics of comets. In addition to contributing to the improvement of ephemerides and of rotational models, nongravitational effects can help constrain the regional distribution and temporal evolution of cometary activity, which in turn provides input for…
A Model-insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
Trac, Hy; Cain, Christopher; D'Aloisio, Anson +2 more
We examine the impact of baryon-dark matter relative velocities on intergalactic small-scale structure and the 21 cm signal during reionization. Streaming velocities reduced clumping in the intergalactic medium on mass scales of ∼104-108 M⊙. This effect produced a distinct baryon acoustic oscillation (BAO) feature …
The nature of the companion in the Wolf-Rayet system EZ Canis Majoris
Schmutz, W.; Koenigsberger, G.
Context. EZ Canis Majoris is a classical Wolf-Rayet star whose binary nature has been debated for decades. It was recently modeled as an eccentric binary with a periodic brightening at periastron of the emission originating in a shock heated zone near the companion.
Aims: The focus of this paper is to further test the binary model and to cons…