Search Publications
A New Flaring Black Widow Candidate and Demographics of Black Widow Millisecond Pulsars in the Galactic Field
Strader, Jay; Ray, Paul S.; Kerr, Matthew +4 more
We present the discovery of a new optical/X-ray source likely associated with the Fermi γ-ray source 4FGL J1408.6-2917. Its high-amplitude periodic optical variability, large spectroscopic radial-velocity semiamplitude, evidence for optical emission lines and flaring, and X-ray properties together imply the source is probably a new black widow mil…
Tidal Distortions in NGC1052-DF2 and NGC1052-DF4: Independent Evidence for a Lack of Dark Matter
van Dokkum, Pieter; Abraham, Roberto; Pasha, Imad +11 more
Two ultra-diffuse galaxies in the same group, NGC1052-DF2 and NGC1052-DF4, have been found to have little or no dark matter and to host unusually luminous globular cluster populations. Such low-mass diffuse objects in a group environment are easily disrupted and are expected to show evidence of tidal distortions. In this work, we present deep new …
An elliptical accretion disk following the tidal disruption event AT 2020zso
Gromadzki, M.; Young, D.; Inserra, C. +25 more
Aims: The modelling of spectroscopic observations of tidal disruption events (TDEs) to date suggests that the newly formed accretion disks are mostly quasi-circular. In this work we study the transient event AT 2020zso, hosted by an active galactic nucleus (AGN; as inferred from narrow emission line diagnostics), with the aim of characterisin…
Revisiting bright δ Scuti stars and their period-luminosity relation with TESS and Gaia DR3
Bedding, Timothy R.; Murphy, Simon J.; Hey, Daniel R. +1 more
We have used NASA's TESS mission to study catalogued δ Scuti stars. We examined TESS light curves for 434 stars, including many for which few previous observations exist. We found that 62 are not δ Scuti pulsators, with most instead showing variability from binarity. For the 372 δ Scuti stars, we provide a catalogue of the period and amplitude of …
Slow Star Formation in the Milky Way: Theory Meets Observations
Ostriker, Eve C.; Evans, Neal J.; Kim, Jeong-Gyu
The observed star formation rate of the Milky Way can be explained by applying a metallicity-dependent factor to convert CO luminosity to molecular gas mass and a star formation efficiency per freefall time that depends on the virial parameter of a molecular cloud. These procedures also predict the trend of star formation rate surface density with…
Post-starburst Galaxies in the Centers of Intermediate-redshift Clusters
Richard, Johan; Mingozzi, Matilde; Fritz, Jacopo +17 more
We present results from MUSE spatially resolved spectroscopy of 21 post-starburst galaxies in the centers of eight clusters from z ~ 0.3 to z ~ 0.4. We measure spatially resolved star formation histories (SFHs), the time since quenching (t Q ), and the fraction of stellar mass assembled in the past 1.5 Gyr (µ 1.5). The…
The GAPS Programme at TNG. XXXII. The revealing non-detection of metastable He I in the atmosphere of the hot Jupiter WASP-80b
Scandariato, G.; Pagano, I.; Khodachenko, M. L. +38 more
Context. Because of its proximity to an active K-type star, the hot Jupiter WASP-80b has been identified as a possible excellent target for detecting and measuring He I absorption in the upper atmosphere.
Aims: Our aim was to look for, and eventually measure and model, metastable He I atmospheric absorption.
Methods: We observed four pri…
Evidence that the Hot Jupiter WASP-77 A b Formed Beyond Its Parent Protoplanetary Disk's H2O Ice Line
Sing, David K.; Lothringer, Joshua D.; Reggiani, Henrique +2 more
Idealized protoplanetary disk and giant planet formation models have been interpreted to suggest that a giant planet's atmospheric abundances can be used to infer its formation location in its parent protoplanetary disk. It has recently been reported that the hot Jupiter WASP-77 A b has subsolar atmospheric carbon and oxygen abundances with a sola…
Effects of UV Stellar Spectral Uncertainty on the Chemistry of Terrestrial Atmospheres
Youngblood, Allison; Kempton, Eliza M. -R.; Arney, Giada +2 more
The upcoming deployment of the James Webb Space Telescope will dramatically advance our ability to characterize exoplanet atmospheres, both in terms of precision and sensitivity to smaller and cooler planets. Disequilibrium chemical processes dominate these cooler atmospheres, requiring accurate photochemical modeling of such environments. The hos…
TOI-3714 b and TOI-3629 b: Two Gas Giants Transiting M Dwarfs Confirmed with the Habitable-zone Planet Finder and NEID
Kobulnicky, Henry A.; Cochran, William D.; Mahadevan, Suvrath +36 more
We confirm the planetary nature of two gas giants discovered by the Transiting Exoplanet Survey Satellite to transit M dwarfs. TOI-3714 (V = 15.24, J = 11.74) is an M2 dwarf hosting a hot Jupiter (M p = 0.70 ± 0.03 M J and R p = 1.01 ± 0.03 R J ) on an orbital period of 2.154849 ± 0.000001 days wi…