Search Publications
A Census of the TW Hya Association with Gaia
Luhman, K. L.
I have used high-precision photometry and astrometry from the third data release of Gaia to perform a survey for members of the TW Hya association (TWA). I have identified candidate members that appear to share similar kinematics and ages with bona fide members compiled by Gagné et al. (2017), and I have assessed their membership using radial velo…
The disappearances of six supernova progenitors
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +8 more
As part of a larger completed Hubble Space Telescope (HST) Snapshot program, we observed the sites of six nearby core-collapse supernovae (SNe) at high spatial resolution: SN 2012A, SN 2013ej, SN 2016gkg, SN 2017eaw, SN 2018zd, and SN 2018aoq. These observations were all conducted at sufficiently late times in each SN's evolution to demonstrate th…
Dark Matter Halo Properties of the Galactic Dwarf Satellites: Implication for Chemo-dynamical Evolution of the Satellites and a Challenge to Lambda Cold Dark Matter
Hirai, Yutaka; Hayashi, Kohei; Chiba, Masashi +1 more
Elucidating dark matter density profiles in Galactic dwarf satellites is essential to understanding not only the quintessence of dark matter, but also the evolution of the satellites themselves. In this work, we present the current constraints on dark matter densities in Galactic ultrafaint dwarf (UFD) and diffuse galaxies. Applying our constructe…
GRB 160410A: The first chemical study of the interstellar medium of a short GRB
D'Avanzo, P.; Campana, S.; Melandri, A. +27 more
Short gamma-ray bursts (SGRBs) are produced by the coalescence of compact binary systems which are remnants of massive stars. GRB 160410A is classified as a short-duration GRB with extended emission and is currently the farthest SGRB with a redshift determined from an afterglow spectrum and also one of the brightest SGRBs to date. The fast reactio…
TOI-1695 b: A Water World Orbiting an Early-M Dwarf in the Planet Radius Valley
López-Morales, Mercedes; Bieryla, Allyson; Latham, David W. +39 more
Characterizing the bulk compositions of transiting exoplanets within the M dwarf radius valley offers a unique means to establish whether the radius valley emerges from an atmospheric mass-loss process or is imprinted by planet formation itself. We present the confirmation of such a planet orbiting an early-M dwarf (T mag = 11.0294 ± 0.…
Simulations of High-redshift [O III] Emitters: Chemical Evolution and Multiline Diagnostics
Yoshida, Naoki; Nakazato, Yurina; Ceverino, Daniel
Recent observations by the James Webb Space Telescope discovered a number of high-redshift galaxies with strong emission lines from doubly ionized oxygen. Combined with Atacama Large Millimeter/submillimeter Array observations of far-infrared lines, multiline diagnostics can be applied to the high-redshift galaxies in order to probe the physical c…
A twisted and precessing Cepheid warp in the outer Milky Way disc
Schönrich, Ralph; Dehnen, Walter; Semczuk, Marcin
We examine the Galactic warp in a sample of all classical Cepheids with Gaia Data Release 3 radial velocity. In each radial bin, we determine (1) the inclined plane normal to the mean orbital angular momentum of the stars and (2) that best fitting their positions. We find no warping inside $R\approx 11\,$kpc; for larger R, the disc is increasingly…
Modelling of the post-asymptotic giant branch phase as a tool to understand asymptotic giant branch evolution and nucleosynthesis
Dell'Agli, F.; Ventura, P.; Van Winckel, H. +3 more
We study a sample of single Galactic post-asymptotic giant branch (post-AGB) stars with known surface chemical composition. Gaia EDR3 and Gaia DR3 parallaxes have enabled accurate determinations of the luminosities of these objects, thus making it possible to characterize them in terms of their initial masses, chemical compositions, and progenitor…
Optical and mid-infrared line emission in nearby Seyfert galaxies
Pozzi, F.; Feltre, A.; Marchetti, L. +24 more
Line ratio diagnostics provide valuable clues as to the source of ionizing radiation in galaxies with intense black hole accretion and starbursting events, such as local Seyfert galaxies or galaxies at the peak of their star formation history. We aim to provide a reference joint optical and mid-IR line ratio analysis for studying active galactic n…
A sample of fast radio bursts discovered and localized with MeerTRAP at the MeerKAT telescope
Prochaska, J. Xavier; Kramer, M.; Wu, J. +14 more
We present a sample of well-localized fast radio bursts (FRBs) discovered by the MeerTRAP project at the MeerKAT telescope in South Africa. We discovered the three FRBs in single coherent tied-array beams and localized them to an area of ~1 arcmin2. We investigate their burst properties, scattering, repetition rates, and localizations i…