Search Publications
The Apache Point Observatory Catalog of Optical Diffuse Interstellar Bands
Zhao, Gang; York, Donald G.; Welty, Daniel E. +7 more
Aiming for a new and more comprehensive DIB catalog between 4000 and 9000 Å, we revisited the Atlas Catalog based on the observations of HD 183143 and HD 204827. Twenty-five medium to highly reddened sight lines were selected, sampling a variety of spectral types of the background star and the interstellar environments. The median signal-to-noise …
TESS Delivers Its First Earth-sized Planet and a Warm Sub-Neptune
Butler, R. Paul; Vanderburg, Andrew; Latham, David W. +48 more
The future of exoplanet science is bright, as Transiting Exoplanet Survey Satellite (TESS) once again demonstrates with the discovery of its longest-period confirmed planet to date. We hereby present HD 21749b (TOI 186.01), a sub-Neptune in a 36 day orbit around a bright (V = 8.1) nearby (16 pc) K4.5 dwarf. TESS measures HD 21749b to be {2.61}
Sulfur Chemistry in Protoplanetary Disks: CS and H2CS
Bergner, Jennifer B.; Le Gal, Romane; Loomis, Ryan A. +2 more
The nature and abundance of sulfur chemistry in protoplanetary disks (PPDs) may impact the sulfur inventory on young planets and therefore their habitability. PPDs also offer an interesting test bed for sulfur chemistry models, since each disk shows a diverse set of environments. In this context, we present new sulfur molecule observations in PPDs…
Follow-up of the Neutron Star Bearing Gravitational-wave Candidate Events S190425z and S190426c with MMT and SOAR
Reichart, D. E.; Berger, E.; Chornock, R. +23 more
On 2019 April 25.346 and 26.640 UT the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo gravitational-wave (GW) observatory announced the detection of the first candidate events in Observing Run 3 that contained at least one neutron star (NS). S190425z is a likely binary neutron star (BNS) merger at d L = 156 ± 41 …
Prompt Emission Polarimetry of Gamma-Ray Bursts with the AstroSat CZT Imager
Rao, A. R.; Bhalerao, Varun; Mate, Sujay +10 more
X-ray and gamma-ray polarization measurements of the prompt emission of gamma-ray bursts (GRBs) are believed to be extremely important for testing various models of GRBs. So far, the available measurements of hard X-ray polarization of GRB prompt emission have not significantly constrained the GRB models, particularly because of the difficulty of …
The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. I. Assessment of Multi-scale Variations
Kruijssen, J. M. Diederik; Rosolowsky, Erik; Chevance, Mélanie +21 more
The processes regulating star formation in galaxies are thought to act across a hierarchy of spatial scales. To connect extragalactic star formation relations from global and kiloparsec-scale measurements to recent cloud-scale resolution studies, we have developed a simple, robust method that quantifies the scale dependence of the relative spatial…
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the Molecular Gas in CO-selected Galaxies
Carilli, Chris; Somerville, Rachel S.; Bacon, Roland +31 more
We analyze the interstellar medium properties of a sample of 16 bright CO line emitting galaxies identified in the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Large Program. This CO-selected galaxy sample is complemented by two additional CO line emitters in the UDF that are identified based on their Multi-Unit Spectroscopic …
Masses and Implications for Ages of Low-mass Pre-main-sequence Stars in Taurus and Ophiuchus
Schaefer, Gail H.; Grosso, N.; Prato, L. +8 more
The accuracy of masses of pre-main-sequence stars derived from their locations on the Hertzsprung-Russell diagram (HRD) can be tested by comparison with accurate and precise masses determined independently. We present 29 single stars in the Taurus star-forming region (SFR) and 3 in the Ophiuchus SFR with masses measured dynamically to a precision …
Cassini Ring Seismology as a Probe of Saturn’s Interior. I. Rigid Rotation
Fortney, Jonathan J.; Marley, Mark S.; Mankovich, Christopher +1 more
Seismology of the gas giants holds the potential to resolve long-standing questions about their internal structure and rotation state. We construct a family of Saturn interior models constrained by the gravity field and compute their adiabatic mode eigenfrequencies and corresponding Lindblad and vertical resonances in Saturn’s C ring, where more t…
The Black Hole-Bulge Mass Relation Including Dwarf Galaxies Hosting Active Galactic Nuclei
Greene, Jenny E.; Schutte, Zachary; Reines, Amy E.
We present a new relationship between central black hole (BH) mass and host galaxy stellar bulge mass extending to the lowest BH masses known in dwarf galaxies (M BH ≲ 105 M ⊙ M ⋆ ∼ 109 M ⊙). We have obtained visible and near-infrared Hubble Space Telescope imaging of seven dwarf ga…