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High-resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1
Schmidt, B. P.; Da Costa, G. S.; Marino, A. F. +13 more
We present chemical abundances for 21 elements (from Li to Eu) in 150 metal-poor Galactic stars spanning -4.1 < [Fe/H] < -2.1. The targets were selected from the SkyMapper survey and include 90 objects with [Fe/H] ≤ -3 of which some 15 have [Fe/H] ≤ -3.5. When combining the sample with our previous studies, we find that the metallicity distr…
Kinematics of the Circumgalactic Medium of a z = 0.77 Galaxy from Mg II Tomography
Faucher-Giguère, Claude-André; Sanders, Ryan L.; Stark, Daniel P. +5 more
Galaxy evolution is thought to be driven in large part by the flow of gas between galaxies and the circumgalactic medium (CGM), a halo of metal-enriched gas extending out to ≳100 kpc from each galaxy. Studying the spatial structure of the CGM holds promise for understanding these gas flow mechanisms; however, the common method of using background …
Gaia Gaps and the Physics of Low-mass Stars. I. The Fully Convective Boundary
Jao, Wei-Chun; Feiden, Gregory A.; Skidmore, Khian
The Gaia M-dwarf gap is a significant underdensity of stars observed near MG = 10.2 in a color-magnitude diagram for stars within 200 pc of the Sun. It has been proposed that the gap is the manifestation of structural instabilities within stellar interiors due to nonequilibrium 3He fusion prior to some stars becoming fully co…
A Model for the Coupled Eruption of a Pseudostreamer and Helmet Streamer
Lynch, B. J.; Antiochos, S. K.; Kumar, P. +3 more
A highly important aspect of solar activity is the coupling between eruptions and the surrounding coronal magnetic field topology, which determines the trajectory and morphology of the event and can even lead to sympathetic eruptions from multiple sources. In this paper, we report on a numerical simulation of a new type of coupled eruption, in whi…
Revisiting the dust destruction efficiency of supernovae
De Looze, I.; Gomez, H. L.; Barlow, M. J. +3 more
Dust destruction by supernovae is one of the main processes removing dust from the interstellar medium (ISM). Estimates of the efficiency of this process, both theoretical and observational, typically assume a shock propagating into a homogeneous medium, whereas the ISM possesses significant substructure in reality. We self-consistently model the …
Measuring the fine-structure constant on a white dwarf surface; a detailed analysis of Fe V absorption in G191-B2B
Barstow, M. A.; Webb, J. K.; Carswell, R. F. +12 more
The gravitational potential ϕ = GM/Rc2 at the surface of the white dwarf G191-B2B is 10 000 times stronger than that at the Earth's surface. Numerous photospheric absorption features are detected, making this a suitable environment to test theories in which the fundamental constants depend on gravity. We have measured the fine-structure…
Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves
Rice, Malena; Wang, Songhu; Zhou, Xu +11 more
We present 127 new transit light curves for 39 hot Jupiter systems, obtained over the span of 5 yr by two ground-based telescopes. A homogeneous analysis of these newly collected light curves together with archived spectroscopic, photometric, and Doppler velocimetric data using EXOFASTv2 leads to a significant improvement in the physical and orbit…
Dissecting the stellar content of Leo I: a dwarf irregular caught in transition
Monelli, M.; Cassisi, S.; Gallart, C. +7 more
Leo I is considered one of the youngest dwarf spheroidals (dSph) in the Local Group. Its isolation, extended star formation history (SFH), and recent perigalacticon passage (∼1 Gyr ago) make Leo I one of the most interesting nearby stellar systems. Here, we analyse deep photometric Hubble Space Telescope data via colour-magnitude diagram fitting t…
Molecular Gas Filaments and Fallback in the Ram Pressure Stripped Coma Spiral NGC 4921
Tonnesen, S.; Smith, R.; Cramer, W. J. +6 more
We investigate the effects of ram pressure on the molecular interstellar medium (ISM) in the disk of the Coma cluster galaxy NGC 4921 via high-resolution CO observations. We present 6″ resolution CARMA CO(1-0) observations of the full disk, and 0"4 resolution Atacama Large Millimeter/submillimeter Array CO(2-1) observations of the leading quadrant…
Precise Transit and Radial-velocity Characterization of a Resonant Pair: The Warm Jupiter TOI-216c and Eccentric Warm Neptune TOI-216b
Trifonov, Trifon; Henning, Thomas; Butler, R. Paul +53 more
TOI-216 hosts a pair of warm, large exoplanets discovered by the TESS mission. These planets were found to be in or near the 2:1 resonance, and both of them exhibit transit timing variations (TTVs). Precise characterization of the planets' masses and radii, orbital properties, and resonant behavior can test theories for the origins of planets orbi…