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Resolving the Dust-to-Metals Ratio and CO-to-H2 Conversion Factor in the Nearby Universe
Sandstrom, Karin M.; Leroy, Adam K.; Schruba, Andreas +8 more
We investigate the relationship between the dust-to-metals ratio (D/M) and the local interstellar medium environment at ∼2 kpc resolution in five nearby galaxies: IC 342, M31, M33, M101, and NGC 628. A modified blackbody model with a broken power-law emissivity is used to model the dust emission from 100 to 500 µm observed by Herschel. We ut…
The Spitzer/IRAC Legacy over the GOODS Fields: Full-depth 3.6, 4.5, 5.8, and 8.0 µm Mosaics and Photometry for >9000 Galaxies at z 3.5-10 from the GOODS Reionization Era Wide-area Treasury from Spitzer (GREATS)
Franx, Marijn; Illingworth, Garth D.; Labbé, Ivo +9 more
We present the deepest Spitzer/InfraRed Array Camera (IRAC) 3.6, 4.5, 5.8, and 8.0 µm wide-area mosaics yet over the Great Observatories Origins Deep Survey (GOODS)-N and GOODS-S fields as part of the GOODS Reionization Era wide-Area Treasury from Spitzer (GREATS) project. We reduced and mosaicked in a self-consistent way observations taken …
Grain Growth in Escaping Atmospheres: Implications for the Radius Inflation of Super-Puffs
Ohno, Kazumasa; Tanaka, Yuki A.
Super-puffs-low-mass exoplanets with extremely low bulk density-are attractive targets for exploring their atmospheres and formation processes. Recent studies suggested that the large radii of super-puffs may be caused by atmospheric dust entrained in the escaping atmospheres. In this study, we investigate how the dust grows in escaping atmosphere…
HL Dra: an active Algol-like binary system with a pulsating component star and a cool third body
Shi, Xiang-dong; Qian, Sheng-bang; Li, Lin-jia +1 more
HL Draconis (HL Dra) is an oscillating eclipsing binary with an orbital period of 0.944276 d. By analysing the light curves observed with the Transiting Exoplanet Survey Satellite (TESS), it has been detected that HL Dra is an Algol-like binary system with a mass ratio of 0.361, where the radius filling factor (=r/RL) of the primary and…
Outflows in the radio-intermediate quasar III Zw 2: a polarization study with the EVLA and uGMRT
Ho, L. C.; Ishwara-Chandra, C. H.; Harrison, C. M. +4 more
We present results from a polarization study of the radio-intermediate quasar, III Zw 2, at a redshift of 0.089, with the upgraded Giant Metrewave Radio Telescope (uGMRT) at 685 MHz and the Karl G. Jansky Very Large Array (VLA) at 5 and 34 GHz. We detect a kpc-scale outflow, exhibiting transverse magnetic (B-) fields. The curved jet terminates in …
Mass and density of the transiting hot and rocky super-Earth LHS 1478 b (TOI-1640 b)
Kuzuhara, M.; Tamura, M.; Kudo, T. +52 more
One of the main objectives of the Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of small rocky planets around relatively bright nearby stars. Here, we report the discovery and characterization of the transiting super-Earth planet orbiting LHS 1478 (TOI-1640). The star is an inactive red dwarf (J ~ 9.6 mag and spectral type …
Head-to-Toe Measurement of El Gordo: Improved Analysis of the Galaxy Cluster ACT-CL J0102-4915 with New Wide-field Hubble Space Telescope Imaging Data
Sifón, Cristóbal; Hughes, John P.; Jee, M. James +6 more
We present an improved weak-lensing (WL) study of the high-z (z = 0.87) merging galaxy cluster ACT-CL J0102-4915 ("El Gordo") based on new wide-field Hubble Space Telescope imaging data. The new imaging data cover the ~3.5 × ~3.5 Mpc region centered on the cluster and enable us to detect WL signals beyond the virial radius, which was not possible …
Revisiting Dynamical Friction: The Role of Global Modes and Local Wakes
Babul, Arif; Quinn, Thomas R.; Mayer, Lucio +4 more
The orbital decay of a perturber within a larger system plays a key role in the dynamics of many astrophysical systems-from nuclear star clusters or globular clusters in galaxies, to massive black holes in galactic nuclei, to dwarf galaxy satellites within the dark matter halos of more massive galaxies. For many decades, there have been various at…
The Ultraviolet Extinction Map and Dust Properties at High Galactic Latitude
Jiang, Biwei; Yuan, Haibo; Li, Jun +1 more
Extinction in ultraviolet is much more significant than in optical or infrared, which can be very informative to precisely measure the extinction and understand the dust properties in the low-extinction areas. The high Galactic latitude sky is such an area, important for studying the extragalactic sky and the universe. Based on the stellar paramet…
The importance of lake breach floods for valley incision on early Mars
Goudge, Timothy A.; Fassett, Caleb I.; Morgan, Alexander M. +1 more
The surface environment of early Mars had an active hydrologic cycle, including flowing liquid water that carved river valleys1-3 and filled lake basins4-6. Over 200 of these lake basins filled with sufficient water to breach the confining topography4,6, causing catastrophic flooding and incision of outlet canyons<…