Search Publications
Optically thick structure in early B-type supergiant stellar winds at low metallicities
Oskinova, Lidia M.; Prinja, Raman K.; Fullerton, Alex W. +6 more
Accurate determination of mass-loss rates from massive stars is important to understand stellar and galactic evolution and enrichment of the interstellar medium. Large-scale structure and variability in stellar winds have significant effects on mass-loss rates. Time-series observations provide direct quantification of such variability. Observation…
Halo densities and pericenter distances of the bright Milky Way satellites as a test of dark matter physics
Andrade, Kevin E.; Kaplinghat, Manoj; Valli, Mauro
We provide new constraints on the dark matter halo density profile of Milky Way (MW) dwarf spheroidal galaxies (dSphs) using the phase-space distribution function (DF) method. After assessing the systematics of the approach against mock data from the Gaia Challenge project, we apply the DF analysis to the entire kinematic sample of well-measured M…
Transit spectroscopy of K2-33b with subaru/IRD: Spin-Orbit alignment and tentative atmospheric helium
Tamura, Motohide; Gaidos, Eric; Hirano, Teruyuki +13 more
Exoplanets in their infancy are ideal targets to probe the formation and evolution history of planetary systems, including the planet migration and atmospheric evolution and dissipation. In this paper, we present spectroscopic observations and analyses of two planetary transits of K2-33b, which is known to be one of the youngest transiting planets…
WD 0141-675: a case study on how to follow-up astrometric planet candidates around white dwarfs
Vanderburg, Andrew; Hermes, J. J.; Toonen, Silvia +22 more
This work combines spectroscopic and photometric data of the polluted white dwarf WD 0141-675, which has a now retracted astrometric super-Jupiter candidate, and investigates the most promising ways to confirm Gaia astrometric planetary candidates and obtain follow-up data. Obtaining precise radial velocity measurements for white dwarfs is challen…
Can early dark energy be probed by the high-redshift galaxy abundance?
Gong, Yan; Wang, Xin; Liu, Weiyang +1 more
The analysis of the cosmic microwave background data acquired by the Atacama Cosmology Telescope and the large-scale ($\ell \lesssim 1300$) Planck Telescope show a preference for the early dark energy (EDE) theory, which was set to alleviate the Hubble tension of the $\Lambda$ cold dark matter ($\Lambda$CDM) model by decreasing the sound horizon $…
The first comprehensive study of a giant nebula around a radio-quiet quasar in the z < 1 Universe
Brinchmann, Jarle; Maseda, Michael V.; Johnson, Sean D. +10 more
We present the first comprehensive study of a giant, ≈70 kpc-scale nebula around a radio-quiet quasar at z < 1. The analysis is based on deep integral field spectroscopy with Multi-Unit Spectroscopic Explorer of the field of HE 0238-1904, a luminous quasar at z = 0.6282. The nebula emits strongly in [O II], $\rm H \beta$, and [O III], and the q…
The δ Scuti stars of the Cep-Her Complex - I. Pulsator fraction, rotation, asteroseismic large spacings, and the νmax relation
Bedding, Timothy R.; Murphy, Simon J.; Mani, Prasad +2 more
We identify delta Scuti (
Repainting the colour-mass diagrams by unearthing the green mountain: dust-rich S0 galaxies in the colour-(galaxy stellar mass) diagram, and the colour-(black hole mass) relations for dust-poor versus dust-rich galaxies
Graham, Alister W.
Lenticular galaxies are notoriously misclassified as elliptical galaxies and, as such, a (disc inclination)-dependent correction for dust is often not applied to the magnitudes of dusty lenticular galaxies. This results in overly red galaxy colours, impacting their distribution in the colour-magnitude diagram. It is revealed how this has led to an…
Probing supermassive black hole growth and its dependence on stellar mass and star formation rate in low-redshift galaxies
Georgakakis, A.; Vignali, C.; Paolillo, M. +4 more
We present an improved study of the relation between supermassive black hole growth and their host galaxy properties in the local Universe (z < 0.33). To this end, we build an extensive sample combining spectroscopic measurements of star formation rate (SFR) and stellar mass from Sloan Digital Sky Survey, with specific Black Hole accretion rate…
Benchmarking the IRDC G351.77-0.53: Gaia DR3 distance, mass distribution, and star formation content
Megeath, S. T.; Xu, Fengwei; Stutz, A. M. +4 more
While intensively studied, it remains unclear how the star formation (SF) in infrared dark clouds (IRDCs) compares to that of nearby clouds. We study G351.77-0.53 (henceforth G351), a cluster-forming filamentary IRDC. We begin by characterizing its young stellar object (YSO) content. Based on the average parallax of likely members, we obtain a Gai…