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Hunting Axion Dark Matter with Protoplanetary Disk Polarimetry
Tazaki, Ryo; Toma, Kenji; Fujita, Tomohiro
We find that the polarimetric observations of protoplanetary disks are useful to search for ultralight axion dark matter. Axion dark matter predicts the rotation of the linear polarization plane of propagating light, and protoplanetary disks are ideal targets to observe it. We show that a recent observation puts the tightest constraint on the axio…
Detection of the nearest Jupiter analogue in radial velocity and astrometry data
Janson, Markus; Anglada-Escudé, Guillem; Feng, Fabo +4 more
The presence of Jupiter is crucial to the architecture of the Solar system and models underline this to be a generic feature of planetary systems. We find the detection of the difference between the position and motion recorded by the contemporary astrometric satellite Gaia and its precursor Hipparcos can be used to discover Jupiter-like planets. …
Star cluster catalogues for the LEGUS dwarf galaxies
Schaerer, D.; Östlin, G.; Herrero, A. +62 more
We present the star cluster catalogues for 17 dwarf and irregular galaxies in the HST Treasury Program `Legacy ExtraGalactic UV Survey' (LEGUS). Cluster identification and photometry in this sub-sample are similar to that of the entire LEGUS sample, but special methods were developed to provide robust catalogues with accurate fluxes due to low clu…
Contact binaries at the short period cut-off - I. Statistics and the first photometric investigations of 10 totally eclipsing systems
Li, Kai; Xia, Qi-Qi; Gao, Xing +5 more
The period distribution of contact binaries exhibits a very sharp short period cut-off at 0.22 d. In order to provide valuable information on this short period limit, we observed 10 totally eclipsing contact binaries with orbital periods near this cut-off. By detailed analysis using the W-D code, we determined that two of these systems are A-subty…
Assessing the effect of lens mass model in cosmological application with updated galaxy-scale strong gravitational lensing sample
Shu, Yiping; Cao, Xiaoyue; Chen, Yun +1 more
By comparing the dynamical and lensing masses of early-type lens galaxies, one can constrain both the cosmological parameters and the density profiles of galaxies. We explore the constraining power on cosmological parameters and the effect of the lens mass model in this method with 161 galaxy-scale strong lensing systems, which is currently the la…
Back to the Lithium Plateau with the [Fe/H] < -6 Star J0023+0307
Aguado, David S.; Allende Prieto, Carlos; Rebolo, Rafael +1 more
We present an analysis of the Ultraviolet and Visual Echelle Spectrograph (UVES) high-resolution spectroscopic observations at the 8.2 m Very Large Telescope of J0023+0307, a main-sequence extremely iron-poor dwarf star. We are unable to detect iron lines in the spectrum but derive [Fe/H] < -6.1 from the Ca II resonance lines assuming [Ca/Fe] ≥…
The SPIRITS Sample of Luminous Infrared Transients: Uncovering Hidden Supernovae and Dusty Stellar Outbursts in Nearby Galaxies
Williams, Robert E.; Kilpatrick, Charles D.; Tinyanont, Samaporn +23 more
We present a systematic study of the most luminous (M IR [Vega magnitudes] brighter than -14) infrared (IR) transients discovered by the SPitzer InfraRed Intensive Transients Survey (SPIRITS) between 2014 and 2018 in nearby galaxies (D < 35 Mpc). The sample consists of nine events that span peak IR luminosities of M [4.5],peak
Spectrophotometric Parallaxes with Linear Models: Accurate Distances for Luminous Red-giant Stars
Hogg, David W.; Rix, Hans-Walter; Eilers, Anna-Christina
With contemporary infrared spectroscopic surveys like APO Galactic Evolution Experiment (APOGEE), red-giant stars can be observed to distances and extinctions at which Gaia parallaxes are not highly informative. Yet the combination of effective temperature, surface gravity, composition, and age—all accessible through spectroscopy—determines a gian…
Catalogues of active galactic nuclei from Gaia and unWISE data
McMahon, Richard G.; Belokurov, Vasily; Auger, Matthew W. +4 more
We present two catalogues of active galactic nucleus (AGN) candidates selected from the latest data of two all-sky surveys - Data Release 2 of the Gaia mission and the unWISE catalogue of the Wide-field Infrared Survey Explorer (WISE). We train a random forest classifier to predict the probability of each source in the Gaia-unWISE joint sample bei…
Extended halo of NGC 2682 (M 67) from Gaia DR2
Jordi, C.; Cantat-Gaudin, T.; Balaguer-Núñez, L. +8 more
Context. NGC 2682 is a nearby open cluster that is approximately 3.5 Gyr old. Dynamically, most open clusters are expected to dissolve on shorter timescales of ≈1 Gyr. That it has survived until now means that NGC 2682 was likely much more massive in the past and is bound to have an interesting dynamical history.
Aims: We investigate the spat…