Search Publications
Single-lined Spectroscopic Binary Star Candidates from a Combination of the RAVE and Gaia DR2 Surveys
Grebel, Eva K.; Steinmetz, Matthias; Bland-Hawthorn, Joss +11 more
The combination of the final version of the Radial Velocity Experiment (RAVE) spectroscopic survey data release 6 with radial velocities (RVs) and astrometry from Gaia DR2 allows us to identify and create a catalog of single-lined binary star candidates (SB1), their inferred orbital parameters, and to inspect possible double-lined binary stars (SB…
Understanding Formation of Young, Distributed Low-mass Stars and Clusters in the W4 Cloud Complex
Samal, Manash R.; Sharma, Saurabh; Panwar, Neelam +2 more
It is well known that most of the stars form in rich clusters. However, recent Spitzer observations have shown that a significant number of stars also form in the distributed mode; their origin is not well understood. In this work, we aim to investigate clustered and distributed modes of star formation in the W4 complex. To do so, we identified an…
Hubble Ultraviolet Spectroscopy of Jupiter Trojans
Ehlmann, Bethany L.; Brown, Michael E.; Mahjoub, Ahmed +2 more
We present the first ultraviolet spectra of Jupiter Trojans. These observations were carried out using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope and cover the wavelength range 200-550 nm at low resolution. The targets include objects from both of the Trojan color subpopulations (less-red and red). We do not observe any…
K2-287 b: An Eccentric Warm Saturn Transiting a G-dwarf
Henning, Thomas; Jordán, Andrés; Espinoza, Néstor +23 more
We report the discovery of K2-287b, a Saturn mass planet orbiting a G-dwarf with a period of P ≈ 15 days. First uncovered as a candidate using K2 campaign 15 data, follow-up photometry and spectroscopy were used to determine a mass {M}{{P}}=0.317+/- 0.026 {M}{{J}}, radius {R}{{P}}=0.833+/- 0.013 {R}{{J}}…
Physical Properties of the Close-in Tertiary in the Southern Triple-lined System VZ Lib
Qian, S. -B.; Liao, W. -P.; Sarotsakulchai, T.
VZ Lib is a southern triple-lined system. By analyzing all available times of light minima, orbital period changes are revisited in detail. We discovered that the observed-calculated (O - C) curve shows a long-term period decrease at a rate of {dP}/{dt}=-2.25× {10}-7 {days yr}}-1, revealing a mass transfer from the more massi…
The Blueshift of the C IV Broad Emission Line in QSOs
Bian, Wei-Hao; Ge, Xue; Zhao, Bi-Xuan +1 more
For the sample from Ge et al. of 87 low-z Palomar-Green quasi-stellar objects (QSOs) and 130 high-z QSOs (0 < z < 5) with {{H}}β -based single-epoch supermassive black hole masses, we perform a uniform decomposition of the C IV λ1549 broad-line profile. Based on the rest frame defined by the [O III] λ5007 narrow emission line, a medium-stron…
Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb
Kollmeier, Juna A.; Morrell, Nidia; Han, Cheongho +67 more
We report the discovery of the microlensing planet OGLE-2018-BLG-0740Lb. The planet is detected with a very strong signal of Δχ 2 ∼ 4630, but the interpretation of the signal suffers from two types of degeneracies. One type is caused by the previously known close/wide degeneracy, and the other is caused by an ambiguity between two solut…
Resolved Imaging of the AR Puppis Circumbinary Disk
Marshall, J. P.; Ertel, S.; Milli, J. +14 more
Circumbinary disks are common around post-asymptotic giant branch (post-AGB) stars with a stellar companion on orbital timescales of a few 100 to few 1000 days. The presence of a disk is usually inferred from the system’s spectral energy distribution and confirmed, for a sub-sample, by interferometric observations. We used the Spectro-Polarimetric…
K2-288Bb: A Small Temperate Planet in a Low-mass Binary System Discovered by Citizen Scientists
Schlieder, Joshua E.; Howard, Andrew W.; Petigura, Erik A. +23 more
Observations from the Kepler and K2 missions have provided the astronomical community with unprecedented amounts of data to search for transiting exoplanets and other astrophysical phenomena. Here, we present K2-288, a low-mass binary system (M2.0 ± 1.0; M3.0 ± 1.0) hosting a small (R p = 1.9 R ⊕), temperate (T eq …
Visual Orbits of Spectroscopic Binaries with the CHARA Array. I. HD 224355
Gies, Douglas R.; Lester, Kathryn V.; Monnier, John D. +5 more
We present the visual orbit of the double-lined spectroscopic binary HD 224355 from interferometric observations with the CHARA Array, as well as an updated spectroscopic analysis using echelle spectra from the Apache Point Observatory 3.5 m telescope. By combining the visual and spectroscopic orbital solutions, we find the binary components to ha…