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Similarities and Differences of Global Dust Storms in MY 25, 28, and 34
Grassi, D.; Giuranna, M.; Amoroso, M. +2 more
To better understand the dust cycle on Mars during years with planet-encircling dust storms, we analyze the last three events that took place in Mars Year (MY) 25, MY 28, and MY 34. Global dust storms that occurred in MY 25 and MY 34 (June 2018) were taking place during equinox, while the MY 28 storm had an onset after perihelion. Before the expan…
Multi-timescale reverberation mapping of Mrk 335
Ingram, Adam; Mastroserio, Guglielmo; van der Klis, Michiel
Time lags due to X-ray reverberation have been detected in several Seyfert galaxies. The different traveltime between reflected and directly observed rays naturally causes this type of lag, which depends directly on the light-crossing time-scale of the system and hence scales with the mass of the central black hole. Featureless 'hard lags' not ass…
Compressed magnetized shells of atomic gas and the formation of the Corona Australis molecular cloud
André, Ph.; Arzoumanian, D.; Palmeirim, P. +4 more
We present the identification of the previously unnoticed physical association between the Corona Australis molecular cloud (CrA), traced by interstellar dust emission, and two shell-like structures observed with line emission of atomic hydrogen (HI) at 21 cm. Although the existence of the two shells had already been reported in the literature, th…
The K2 Galactic Archaeology Program Data Release 2: Asteroseismic Results from Campaigns 4, 6, and 7
Chaplin, William J.; Davies, Guy R.; Huber, Daniel +18 more
Studies of Galactic structure and evolution have benefited enormously from Gaia kinematic information, though additional, intrinsic stellar parameters like age are required to best constrain Galactic models. Asteroseismology is the most precise method of providing such information for field star populations en masse, but existing samples for the m…
Magnetic activity based on LAMOST medium-resolution spectra and the Kepler survey
Shi, Jianrong; Gao, Qi; Han, Xianming L. +6 more
Stellar magnetic activity is an interesting phenomenon in late-type stars. We use the medium-resolution spectroscopic observations of 406 069 late-type stars from LAMOST to explore their properties. We perform a statistical analysis on the magnetic activity of the stars and their associated physical parameters. Our samples are cross-matched with o…
A Gravitational Redshift Measurement of the White Dwarf Mass-Radius Relation
Cheng, Sihao; Zakamska, Nadia L.; Chandra, Vedant +1 more
The mass-radius relation of white dwarfs is largely determined by the equation of state of degenerate electrons, which causes the stellar radius to decrease as mass increases. Here we observationally measure this relation using the gravitational redshift effect, a prediction of general relativity that depends on the ratio between stellar mass and …
ALMA Observations of Quasar Host Galaxies at z ≃ 4.8
Maiolino, Roberto; Trakhtenbrot, Benny; Netzer, Hagai +4 more
We present ALMA Band 7 data of the [C II] $\lambda 157.74\,\mu {\rm{m}}$ emission line and underlying far-IR (FIR) continuum for 12 luminous quasars at $z\simeq 4.8$ powered by fast-growing supermassive black holes (SMBHs). Our total sample consists of 18 quasars, 12 of which are presented here for the first time. The new sources consist of six He…
Spectral and atmospheric characterisation of a new benchmark brown dwarf HD 13724 B
Ségransan, D.; Delisle, J. -B.; Udry, S. +5 more
Context. HD 13724 is a nearby solar-type star at 43.48 ± 0.06 pc hosting a long-period low-mass brown dwarf detected with the CORALIE echelle spectrograph as part of the historical CORALIE radial-velocity search for extra-solar planets. The companion has a minimum mass of 26.77-2.2+4.4 MJup and an expected semi-maj…
Disk Illumination and Jet Variability of the Herbig Ae Star HD 163296 Using Multi-epoch HST/STIS Optical, Near-IR, and Radio Imagery and Spectroscopy
Fukagawa, Misato; Sitko, Michael L.; Grady, Carol A. +3 more
We present two new epochs of Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph coronagraphic imaging, along with multi-epoch optical, near-IR, and radio monitoring, of the HD 163296 system. We find that ansae features identified in earlier-epoch HST imagery are a fourth ring that resides at a semimajor axis distance of 3"25 (330 au…
The dependence of Type Ia Supernovae SALT2 light-curve parameters on host galaxy morphology
Pruzhinskaya, M. V.; Pauna, N.; Novinskaya, A. K. +1 more
Type Ia Supernovae (SNe Ia) are widely used to measure distances in the Universe. Despite the recent progress achieved in SN Ia standardization, the Hubble diagram still shows some remaining intrinsic dispersion. The remaining scatter in supernova luminosity could be due to the environmental effects that are accounted for as mass step correction i…