Search Publications
Limits on the mass and initial entropy of 51 Eri b from Gaia EDR3 astrometry
Dupuy, Trent J.; Brandt, Timothy D.; Brandt, G. Mirek
51 Eri b is one of the only young planets consistent with a wide range of possible initial entropy states, including the cold-start scenario associated with some models of planet formation by core accretion. The most direct way to constrain the initial entropy of a planet is by measuring its luminosity and mass at a sufficiently young age that the…
Combined spectroscopy and intensity interferometry to determine the distances of the blue supergiants P Cygni and Rigel
Domiciano de Souza, A.; Vakili, F.; Rivet, J. -P. +10 more
In this paper, we report on spatial intensity interferometry measurements within the Hα line on two stars: the Luminous Blue Variable supergiant P Cygni and the late-type B supergiant Rigel. The experimental setup was upgraded to allow simultaneous measurement of two polarization channels, instead of one in our previous setup, and the zero baselin…
Visual binary stars with known orbits in Gaia EDR3
Malkov, Oleg; Chulkov, Dmitry
A total of 3350 objects from the Sixth Catalog of Orbits of Visual Binary Stars (ORB6) are investigated to validate Gaia Early Data Release 3 (EDR3) parallaxes and provide mass estimates for the systems. We show that two-thirds of binaries with a separation of 0.2-0.5 arcsec are left without a parallax solution in EDR3. Special attention is paid t…
A study of the F-giant star θ Scorpii A: a post-merger rapid rotator?
Lewis, Fiona; Bailey, Jeremy; Cotton, Daniel V. +3 more
We report high-precision observations of the linear polarization of the F1III star θ Scorpii. The polarization has a wavelength dependence of the form expected for a rapid rotator, but with an amplitude several times larger than seen in otherwise similar main-sequence stars. This confirms the expectation that lower-gravity stars should have strong…
An edge-on orbit for the eccentric long-period planet HR 5183 b
Vanderburg, Andrew; Pearce, Logan A.; Venner, Alexander
The long-period giant planet HR 5183 b has one of the most extreme orbits among exoplanets known to date, and represents a test for models of their dynamical evolution. In this work, we use Hipparcos-Gaia astrometry to measure the orbital inclination of this planet for the first time and find $i=89.9^{+13.3\circ }_{-13.5}$, fully consistent with e…
V410 Puppis: A useful laboratory for early stellar evolution
Erdem, Ahmet; Sürgit, Derya; Blackford, Mark G. +6 more
New spectrometric (HERCULES) and ground-based multicolour photometric data on the multiple star V410 Puppis are combined with satellite photometry (HIPPARCOS and TESS), as well as historic astrometric observations. Absolute parameters for V410 Pup Aab are derived: MAa = 3.15 ± 0.10, MAb = 1.83 ± 0.08 (M⊙); RAa…
Orbital solution and dynamical masses for the nearby binary system GJ 67 AB
Torres, Guillermo
We report spectroscopic observations of the nearby, 19.5-yr binary system GJ 67AB spanning more than 35 yr. We carry out a global orbital solution combining our radial-velocity measurements with others from the literature going back more than a century, and with all other available astrometric observations. The latter include measurements of the r…
20 Orbits of binaries based on soar speckle observations
Docobo, José A.; Campo, Pedro P.; Mendez, Rene A. +3 more
New observational data obtained during the 2018, 2019, and 2020 speckle runs with the 4.1-m Southern Astrophysical Research (SOAR) telescope located at Cerro Pachón (Chile) allowed us to recalculate the orbits of the visual binaries: WDS 00277-1625 (YR 1 Aa,Ab), WDS 00462-2214 (RST4155), WDS 03124-4425 (JC 8), WDS 07427-3510 (HDS 1091), WDS 10093+…