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A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067
Alonso, R.; Deleuil, M.; Erikson, A. +149 more
Planets with radii between that of the Earth and Neptune (hereafter referred to as `sub-Neptunes') are found in close-in orbits around more than half of all Sun-like stars1,2. However, their composition, formation and evolution remain poorly understood3. The study of multiplanetary systems offers an opportunity to investigate…
The merger fraction of ultramassive white dwarfs
Toonen, Silvia; Bergeron, P.; Kilic, Mukremin +6 more
We search for merger products among the 25 most massive white dwarfs in the Montreal White Dwarf Database 100 pc sample through follow-up spectroscopy and high-cadence photometry. We find an unusually high fraction, 40 per cent, of magnetic white dwarfs among this population. In addition, we identify four outliers in transverse velocity and detect…
The UV luminosity functions of bright z > 8 galaxies: determination from 0.41 deg2 of HST observations along 300 independent sightlines
Treu, Tommaso; Trenti, Michele; Morishita, Takahiro +2 more
We determine the bright end of the rest-frame UV luminosity function (UVLF) at z = 8-10 by selecting bright z ≳ 8 photometric candidates from the largest systematic compilation of HST (pure-)parallel observations to date, the Super-Brightest-of-Reionizing-Galaxies (SuperBoRG) data set. The data set includes ~300 independent sightlines from WFC3 ob…
JWST observations of dust reservoirs in type IIP supernovae 2004et and 2017eaw
Temim, Tea; Van Dyk, Schuyler D.; Filippenko, Alexei V. +37 more
Supernova (SN) explosions have been sought for decades as a possible source of dust in the Universe, providing the seeds of galaxies, stars, and planetary systems. SN 1987A offers one of the most promising examples of significant SN dust formation, but until the James Webb Space Telescope (JWST), instruments have traditionally lacked the sensitivi…
Beyond the bulge-halo conspiracy? Density profiles of early-type galaxies from extended-source strong lensing
Massey, Richard; Lagattuta, David J.; Robertson, Andrew +9 more
Observations suggest that the dark matter and stars in early-type galaxies 'conspire' to produce a surprisingly simple distribution of total mass, ρ(r) ∝ ρ-γ, with γ ≈ 2. We measure the distribution of mass in 48 early-type galaxies that gravitationally lens a resolved background source. By fitting the source light in every pixel of ima…
GOALS-JWST: Small Neutral Grains and Enhanced 3.3 µm PAH Emission in the Seyfert Galaxy NGC 7469
Inami, Hanae; Böker, Torsten; Law, David R. +37 more
We present James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec) integral field spectroscopy of the nearby luminous infrared galaxy NGC 7469. We take advantage of the high spatial/spectral resolution and wavelength coverage of JWST/NIRSpec to study the 3.3 µm neutral polycyclic aromatic hydrocarbon (PAH) grain emission on ~2…
Intracluster light is already abundant at redshift beyond unity
Jee, M. James; Joo, Hyungjin
Intracluster light (ICL) is diffuse light from stars that are gravitationally bound not to individual member galaxies, but to the halo of galaxy clusters. Leading theories1,2 predict that the ICL fraction, defined by the ratio of the ICL to the total light, rapidly decreases with increasing redshift, to the level of a few per cent at z …
Ionized gas kinematics and chemical abundances of low-mass star-forming galaxies at z ∼ 3
Pentericci, L.; Boutsia, K.; Amorín, R. +6 more
Context. Feedback from massive stars plays a crucial role in regulating the growth of young star-forming galaxies (SFGs) and in shaping their interstellar medium (ISM). This feedback contributes to the removal and mixing of metals via galactic outflows and to the clearance of neutral gas, which facilitates the escape of ionizing photons.
Aims…
Picoflare jets power the solar wind emerging from a coronal hole on the Sun
Barczynski, K.; Peter, H.; Chitta, L. P. +17 more
Coronal holes are areas on the Sun with open magnetic field lines. They are a source region of the solar wind, but how the wind emerges from coronal holes is not known. We observed a coronal hole using the Extreme Ultraviolet Imager on the Solar Orbiter spacecraft. We identified jets on scales of a few hundred kilometers, which last 20 to 100 seco…
Chemodynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-s and CEMP-no Stars
Beers, Timothy C.; Placco, Vinicius M.; Mardini, Mohammad +7 more
We construct a sample of 644 carbon-enhanced metal-poor (CEMP) stars with abundance analyses based on moderate- to high-resolution spectroscopic studies. Dynamical parameters for these stars are estimated based on radial velocities, Bayesian parallax-based distance estimates, and proper motions from Gaia EDR3 and DR3, supplemented by additional av…