Search Publications
New Candidates for Planetary-mass Brown Dwarfs in IC 348
Luhman, K. L.; Hapich, C. J.
We have used infrared images obtained with the Wide Field Camera 3 on board the Hubble Space Telescope to search for planetary-mass brown dwarfs in the star-forming cluster IC 348. In those images, we have identified 12 objects that have colors indicative of spectral types later than M8, corresponding to masses of ≲30 MJup at the age of…
Proper-motion Membership Tests for Four Planetary Nebulae in Galactic Globular Clusters
Bond, Howard E.; Sahu, Kailash C.; Bellini, Andrea
Four planetary nebulae (PNe) are considered to be probable or possible members of Galactic globular clusters (GCs). These are Ps 1 = K648 in M15, GJJC 1 = IRAS 18333-2357 in M22, JaFu 1 in Palomar 6, and JaFu 2 in NGC 6441. In addition to lying close to the host GCs on the sky, these PNe have radial velocities that are consistent, within the error…
Time-sequence Spectroscopy of Epsilon CrA: The 518 nm Mg I Triplet Region Analyzed with Broadening Functions
Rucinski, Slavek M.
High-resolution spectroscopic observations of the W UMa-type binary ɛ CrA obtained as a time-monitoring sequence on four full and four partial nights within two weeks have been used to derive orbital elements of the system and discuss the validity of the Lucy model for description of the radial-velocity data. The observations had more extensive te…
A Single-chord Stellar Occultation by the Extreme Trans-Neptunian Object (541132) Leleākūhonua
Sicardy, Bruno; Buie, Marc W.; Leiva, Rodrigo +32 more
A stellar occultation by the extreme large-perihelion trans-Neptunian object (541132) Leleākūhonua (also known by the provisional designation of 2015 TG387) was predicted by the Lucky Star project and observed with the Research and Education Collaborative Occultation Network on 2018 October 20 UT. A single detection and a nearby nondete…
XO-7 b: A Transiting Hot Jupiter with a Massive Companion on a Wide Orbit
Crouzet, Nicolas; Nielsen, Louise D.; Osborn, Hugh P. +16 more
Transiting planets orbiting bright stars are the most favorable targets for follow-up and characterization. We report the discovery of the transiting hot Jupiter XO-7 b and of a second, massive companion on a wide orbit around a circumpolar, bright, and metal-rich G0 dwarf (V = 10.52, {T}eff}=6250+/- 100 {{K}}, [{Fe}/{{H}}]=0.432+/- 0.0…
The Most Probable 3D Orbit for Spectroscopic Binaries
Docobo, José A.; Campo, Pedro P.; Abushattal, Ahmad A.
Binary stars are a very important source of astronomical information. Those short-period binaries observed by means of both spectroscopy and interferometry can provide, through their corresponding orbits, precise values regarding individual masses as well as orbital parallaxes. For this reason, it is fundamental to attempt to optically resolve dou…
Discovery of Two Nearby Post-T Tauri Stellar Associations
Fang, Min; Liu, Chao; Liu, Jiaming
In this work we report the discovery of two new stellar associations in close vicinity of the Sun at roughly 180 and 150 pc. These two associations, u Tau assoc and e Tau assoc, were detected based on their clustering in a multi-dimensional parameter space including α, δ, µα, µδ, and ϖ of Gaia. The fitting of pre-…
Dynamic Observing and Tiling Strategies for the DESI Legacy Surveys
Myers, Adam D.; Schlegel, David J.; Weaver, Benjamin A. +22 more
The Dark Energy Spectroscopic Instrument Legacy Surveys, a combination of three ground-based imaging surveys, have mapped 16,000 deg2 in three optical bands (g, r, and z) to a depth 1-2 mag deeper than the Sloan Digital Sky Survey. Our work addresses one of the major challenges of wide-field imaging surveys conducted at ground-based obs…
Speckle Interferometry of Nearby Multiple Stars: 2007-2019 Positional Measurements and Orbits of Eight Objects
Dyachenko, V.; Beskakotov, A.; Maksimov, A. +4 more
The orbits of eight systems with low-mass components (HIP 14524, HIP 16025, HIP 28671, HIP 46199, HIP 47791, HIP 60444, HIP 61100, and HIP 73085) are presented. Speckle interferometric data were obtained at the 6 m Big Telescope Alt-azimuth Special Astrophysical Observatory of the Russian Academy of Sciences (BTA SAO RAS) from 2007 to 2019. New da…
Exploratory Spectroscopy of Magnetic Cataclysmic Variables Candidates and Other Variable Objects. II
Oliveira, A. S.; Rodrigues, C. V.; Martins, M. +4 more
This is the second paper of a series presenting our search for magnetic cataclysmic variables (mCVs) among candidates selected mostly from the Catalina Real-Time Transient Survey. We present the identification spectra, obtained at the SOAR Telescope, as well as magnitudes and Gaia distances for 45 objects. Of these, 39 objects are identified as CV…