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3D Orbital Architecture of a Dwarf Binary System and Its Planetary Companion
Curiel, Salvador; Sanchez-Bermudez, Joel; Ortiz-León, Gisela N. +1 more
Because of the diversity of stellar masses and orbital sizes of binary systems and the complex interaction between star-star, star-planet, and planet-planet, it has been difficult to fully characterize the planetary systems associated with binary systems. Here, we report high-precision astrometric observations of the low-mass binary system GJ 896A…
The puzzling story of flare inactive ultra fast rotating M dwarfs - I. Exploring their magnetic fields
Ramsay, Gavin; Hakala, Pasi; Doyle, Lauren +2 more
Stars which are rapidly rotating are expected to show high levels of activity according to the activity-rotation relation. However, previous TESS studies have found ultra fast rotating (UFR) M dwarfs with periods less than 1 d displaying low levels of flaring activity. As a result, in this study, we utilize VLT/FORS2 spectro-polarimetric data of 1…
Blueshifted Si IV 1402.77 Å Line Profiles in a Moving Flare Kernel Observed by IRIS
Polito, Vanessa; Dudík, Jaroslav; Lörinčík, Juraj
We analyze the spectra of a slipping flare kernel observed during the 2015 June 22 M6.5-class flare by the Interface Region Imaging Spectrograph (IRIS). During the impulsive and peak phases of the flare, loops exhibiting an apparent slipping motion along the ribbons were observed in the 131 Å channel of SDO/AIA. The IRIS spectrograph slit observed…
Properties of shocked dust grains in supernova remnants
De Looze, I.; Gomez, H. L.; Barlow, M. J. +3 more
Shockwaves driven by supernovae both destroy dust and reprocess the surviving grains, greatly affecting the resulting dust properties of the interstellar medium (ISM). While these processes have been extensively studied theoretically, observational constraints are limited. We use physically motivated models of dust emission to fit the infrared (IR…
Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters
Bica, E.; Barbuy, B.; Cassisi, S. +6 more
Context. RR Lyrae stars are useful standard candles allowing one to derive accurate distances for old star clusters. Based on the recent catalogues from OGLE-IV and Gaia Early Data Release 3 (EDR3), the distances can be improved for a few bulge globular clusters.
Aims: The aim of this work is to derive an accurate distance for the following s…
Measurement of the Relativistic Sunyaev-Zeldovich Correction in RX J1347.5-1145
Zitrin, Adi; Daylan, Tansu; Zemcov, Michael +8 more
We present a measurement of the relativistic corrections to the thermal Sunyaev-Zel'dovich (SZ) effect spectrum, the rSZ effect, toward the massive galaxy cluster RX J1347.5-1145 by combining submillimeter images from Herschel-SPIRE with millimeter wavelength Bolocam maps. Our analysis simultaneously models the SZ effect signal, the population of …
Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility
Wang, Shu; Deng, Li-Cai; Wang, Kun +3 more
The development of large-scale time-domain surveys provides an opportunity to study the physical properties as well as the evolutionary scenario of B-type subdwarfs (sdBs) and M-type dwarfs (dMs). Here, we obtained 33 sdB+dM eclipsing binaries based on the Zwicky Transient Facility (ZTF) light curves and Gaia Early Data Release 3 (EDR3) parallaxes…
The Gaia-ESO Survey: Chemical tagging in the thin disk. Open clusters blindly recovered in the elemental abundance space
Gilmore, G.; Vallenari, A.; Randich, S. +14 more
Context. The chemical makeup of a star provides the fossil information of the environment where it formed. Under this premise, it should be possible to use chemical abundances to tag stars that formed within the same stellar association. This idea - known as chemical tagging - has not produced the expected results, especially within the thin disk …
Gaia astrometric and photometric study of open clusters Dolidze 18 & Ruprecht 70
Tadross, A. L.; Hendy, Y. H.
Here, we conducted a photometric and astrometric study of two open stellar clusters Dolidze 18 and Ruprecht 70, which have not been photometrically studied before. The most important thing for using Gaia (DR2) database lies in the positions, parallax, and proper motions, which make us split cluster members from the field ones and get precise astro…
The Family of V1311 Ori: a Young Sextuple System or a Minicluster?
Tokovinin, Andrei
A compact bound group of four active M-type dwarfs containing V1311 Ori is identified in the Gaia catalog of nearby stars. Located at a distance of 39 pc, it is likely related to the β Pictoris and 32 Ori moving groups by kinematics, isochronal age, and other indicators of youth (Hα emission, presence of lithium, and fast rotation). The brightest …