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A joint SZ-X-ray-optical analysis of the dynamical state of 288 massive galaxy clusters
Smith, M.; Lidman, C.; Zenteno, A. +77 more
We use imaging from the first three years of the Dark Energy Survey to characterize the dynamical state of 288 galaxy clusters at 0.1 ≲ z ≲ 0.9 detected in the South Pole Telescope (SPT) Sunyaev-Zeldovich (SZ) effect survey (SPT-SZ). We examine spatial offsets between the position of the brightest cluster galaxy (BCG) and the centre of the gas dis…
WISPR Imaging of a Pristine CME
Kouloumvakos, Athanasios; Rouillard, Alexis P.; Stenborg, Guillermo +6 more
The Wide-field Imager for Solar Probe (WISPR) on board the Parker Solar Probe (PSP) observed a coronal mass ejection (CME) on 2018 November 1, the first day of the initial PSP encounter. The speed of the CME, approximately 200-300 km s-1 in the WISPR field of view, is typical of slow, streamer blowout CMEs. This event was also observed …
On the first δ Sct-roAp hybrid pulsator and the stability of p and g modes in chemically peculiar A/F stars
Murphy, Simon J.; Hey, Daniel R.; Saio, Hideyuki +4 more
Strong magnetic fields in chemically peculiar A-type (Ap) stars typically suppress low-overtone pressure modes (p modes) but allow high-overtone p modes to be driven. KIC 11296437 is the first star to show both. We obtained and analysed a Subaru spectrum, from which we show that KIC 11296437 has abundances similar to other magnetic Ap stars, and w…
The Leoncino Dwarf Galaxy: Exploring the Low-metallicity End of the Luminosity-Metallicity and Mass-Metallicity Relations
Cannon, John M.; Dolphin, Andrew E.; Skillman, Evan D. +10 more
Extremely metal-poor (XMP) galaxies are low-mass, star-forming galaxies with gas-phase oxygen abundances below 12 + log(O/H) = 7.35 (∼ 1/20 Z⊙). Galaxy evolution scenarios suggest three pathways to form an XMP: (1) secular evolution at low galaxy masses, (2) slow evolution in voids, or (3) dilution of measured abundances from infall of …
Detection of Na, K, and H2O in the hazy atmosphere of WASP-6b
Nikolov, Nikolay; Smalley, Barry; Carter, Aarynn L. +13 more
We present new observations of the transmission spectrum of the hot Jupiter WASP-6b both from the ground with the Very Large Telescope FOcal Reducer and Spectrograph (FORS2) from 0.45 to 0.83 µm, and space with the Transiting Exoplanet Survey Satellite from 0.6 to 1.0 µm and the Hubble Space Telescope (HST) Wide Field Camera 3 from 1.1…
On reverberation mapping lag uncertainties
Brandt, W. N.; Kochanek, C. S.; Peterson, B. M. +5 more
We broadly explore the effects of systematic errors on reverberation mapping lag uncertainty estimates from JAVELIN and the interpolated cross-correlation function (ICCF) method. We focus on simulated light curves from random realizations of the light curves of five intensively monitored AGNs. Both methods generally work well even in the presence …
A Gaia Early DR3 Mock Stellar Catalog: Galactic Prior and Selection Function
Girardi, Léo; Fouesneau, Morgan; Sharma, Sanjib +7 more
We present a mock stellar catalog, matching in volume, depth and data model the content of the planned Gaia early data release 3 (Gaia EDR3). We have generated our catalog (GeDR3mock) using galaxia, a tool to sample stars from an underlying Milky Way (MW) model or from N-body data. We used an updated Besançon Galactic model together with the lates…
EvryFlare. II. Rotation Periods of the Cool Flare Stars in TESS across Half the Southern Sky
Law, Nicholas M.; Corbett, Hank; Fors, Octavi +6 more
We measure rotation periods and sinusoidal amplitudes in Evryscope light curves for 122 two-minute K5-M4 TESS targets selected for strong flaring. The Evryscope array of telescopes has observed all bright nearby stars in the south, producing 2-minute cadence light curves since 2016. Long-term, high-cadence observations of rotating flare stars prob…
MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf
Tamura, M.; Béjar, V. J. S.; Korth, J. +37 more
Context. We report the discovery of TOI 263.01 (TIC 120916706), a transiting substellar object (R = 0.87 RJup) orbiting a faint M3.5 V dwarf (V = 18.97) on a 0.56 d orbit.
Aims: We setout to determine the nature of the Transiting Exoplanet Survey Satellite (TESS) planet candidate TOI 263.01 using ground-based multicolour transit ph…
O2- and CO-rich Atmospheres for Potentially Habitable Environments on TRAPPIST-1 Planets
Hu, Renyu; Wolf, Eric T.; Peterson, Luke
Small exoplanets of nearby M-dwarf stars present the possibility of finding and characterizing habitable worlds within the next decade. TRAPPIST-1, an ultracool M-dwarf star, was recently found to have seven Earth-sized planets of predominantly rocky composition. The planets e, f, and g could have a liquid water ocean on their surface given approp…