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RELICS: Properties of z ≥ 5.5 Galaxies Inferred from Spitzer and Hubble Imaging, Including A Candidate z ∼ 6.8 Strong [O III] emitter
Ouchi, Masami; Mahler, Guillaume; Frye, Brenda L. +26 more
We present constraints on the physical properties (including stellar mass, age, and star formation rate) of 207 6 ≲ z ≲ 8 galaxy candidates from the Reionization Lensing Cluster Survey (RELICS) and Spitzer-RELICS surveys. We measure photometry using T-PHOT and perform spectral energy distribution fitting using EAzY and BAGPIPES. Of the 207 candida…
Anoxic chemical weathering under a reducing greenhouse on early Mars
Liu, J.; Xiao, L.; Michalski, J. R. +3 more
Reduced greenhouse gases such as methane (CH4) and hydrogen (H2) might be the only tenable solution to explain warming of the ancient Martian climate, but direct geological evidence that a reduced atmosphere actually existed on Mars has been lacking. Here we report widespread, strong Fe loss in chemically weathered bedrock se…
The Detection of a Hot Molecular Core in the Extreme Outer Galaxy
Shimonishi, Takashi; Furuya, Kenji; Izumi, Natsuko +1 more
Interstellar chemistry in low-metallicity environments is crucial to understand chemical processes in the past metal-poor universe. Recent studies of interstellar molecules in nearby low-metallicity galaxies have suggested that metallicity has a significant effect on the chemistry of star-forming cores. Here we report the first detection of a hot …
Telltale signs of metal recycling in the circumgalactic medium of a z 0.77 galaxy
Rigby, J. R.; Sharon, K.; Tejos, N. +15 more
We present gravitational-arc tomography of the cool-warm enriched circumgalactic medium (CGM) of an isolated galaxy ('G1') at z ≈ 0.77. Combining VLT/MUSE adaptive-optics and Magellan/MagE echelle spectroscopy, we obtain partially resolved kinematics of Mg II in absorption and [O II] in emission. The unique arc configuration allows us to probe 42 …
Big Three Dragons: A [N II] 122 µm Constraint and New Dust-continuum Detection of a z = 7.15 Bright Lyman-break Galaxy with ALMA
Fujimoto, Seiji; Inoue, Akio K.; Hashimoto, Takuya +6 more
We present new Atacama Large Millimeter/submillimeter Array Band 7 observational results of a Lyman-break galaxy at z = 7.15, B14-65666 ("Big Three Dragons"), which is an object detected in [O III] 88 µm, [C II] 158 µm, and dust continuum emission during the epoch of reionization. Our targets are the [N II] 122 µm fine-structure …
Exoplanet validation with machine learning: 50 new validated Kepler planets
Armstrong, David J.; Gamper, Jevgenij; Damoulas, Theodoros
Over 30 per cent of the $\sim$4000 known exoplanets to date have been discovered using 'validation', where the statistical likelihood of a transit arising from a false positive (FP), non-planetary scenario is calculated. For the large majority of these validated planets calculations were performed using the VESPA algorithm. Regardless of the stren…
A large sub-Neptune transiting the thick-disk M4 V TOI-2406
Gabor, P.; Queloz, D.; Henning, T. +71 more
Context. Large sub-Neptunes are uncommon around the coolest stars in the Galaxy and are rarer still around those that are metal-poor. However, owing to the large planet-to-star radius ratio, these planets are highly suitable for atmospheric study via transmission spectroscopy in the infrared, such as with JWST.
Aims: Here we report the discov…
Red Supergiants in M31 and M33. I. The Complete Sample
Yang, Ming; Ren, Yi; Jiang, Biwei +3 more
The aim of this paper is to establish a complete sample of red supergiants (RSGs) in M31 and M33. The member stars of the two galaxies are selected from the near-infrared (NIR) point sources after removing the foreground dwarfs from their obvious branch in the J - H/H - K diagram with the archival photometric data taken by the UKIRT/WFCAM. This se…
A high pitch angle structure in the Sagittarius Arm
Castro-Ginard, A.; Benjamin, R. A.; Krone-Martins, A. +6 more
Context. In spiral galaxies, star formation tends to trace features of the spiral pattern, including arms, spurs, feathers, and branches. However, in our own Milky Way, it has been challenging to connect individual star-forming regions to their larger Galactic environment owing to our perspective from within the disk. One feature in nearly all mod…
Horizontal spreading of planetary debris accreted by white dwarfs
Ludwig, Hans-Günter; Gänsicke, Boris T.; Veras, Dimitri +8 more
White dwarfs with metal-polluted atmospheres have been studied widely in the context of the accretion of rocky debris from evolved planetary systems. One open question is the geometry of accretion and how material arrives and mixes in the white dwarf surface layers. Using the three-dimensional (3D) radiation hydrodynamics code CO5BOLD, …