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A First Look at Cepheids in a SN Ia Host with JWST
Wenlong Yuan, Adam G. Riess, Stefano Casertano +1
We report the first look at extragalactic Cepheid variables with the James Webb Space Telescope, obtained from a serendipitous (to this purpose) observation of NGC 1365, host of an…
First semi-empirical test of the white dwarf mass-radius relationship using a single white dwarf via astrometric microlensing
Peter McGill, Jay Anderson, Stefano Casertano +15
In November 2019, the nearby single, isolated DQ-type white dwarf LAWD 37 (WD 1142-645) aligned closely with a distant background source and caused an astrometric microlensing even…
An Isolated Stellar-Mass Black Hole Detected Through Astrometric Microlensing
Kailash C. Sahu, Jay Anderson, Stefano Casertano +90
We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry…
New variable stars in the Galactic Bulge: I. The bright regime
N. Kains, A. Calamida, M. Rejkuba +8
We report the detection of 1143 variable stars towards the Galactic bulge, including 320 previously uncatalogued variables, using time-series photometry extracted from data obtaine…
New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant
Adam G. Riess, Stefano Casertano, Wenlong Yuan +8
We present new parallax measurements of 7 long-period (> 10 days) Milky Way Cepheids (SS CMa, XY Car, VY Car, VX Per, WZ Sgr, X Pup and S Vul) using astrometry from spatial scannin…
Microlensing constraints on the mass of single stars from HST astrometric measurements
Noé Kains, A. Calamida, K. C. Sahu +13
We report on the first results from a large-scale observing campaign aiming to use astrometric microlensing to detect and place limits on the mass of single objects, including stel…