Search Publications
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…
The Vertical Motion History of Disk Stars throughout the Galaxy
Ting, Yuan-Sen; Rix, Hans-Walter
It has long been known that the vertical motions of Galactic disk stars increase with stellar age, commonly interpreted as vertical heating through orbit scattering. Here we map the vertical actions of disk stars as a function of age (τ ≤slant 8 {Gyr}) and across a large range of Galactocentric radii, {\overline{R}}GC}, drawing on APOGE…
An Ideal Testbed for Planet-Disk Interaction: Two Giant Protoplanets in Resonance Shaping the PDS 70 Protoplanetary Disk
Baruteau, Clément; Bae, Jaehan; Teague, Richard +7 more
While numerical simulations have been playing a key role in the studies of planet-disk interaction, testing numerical results against observations has been limited so far. With the two directly imaged protoplanets embedded in its circumstellar disk, PDS 70 offers an ideal testbed for planet-disk interaction studies. Using two-dimensional hydrodyna…
Evidence for a Circumplanetary Disk around Protoplanet PDS 70 b
Pinte, Christophe; Casassus, Simon; Girard, Julien +5 more
We present the first observational evidence for a circumplanetary disk (CPD) around the protoplanet PDS 70 b, based on a new spectrum in the K-band acquired with Very Large Telescope/SINFONI. We tested three hypotheses to explain the spectrum: atmospheric emission from the planet with either (1) a single value of extinction, (2) a variable extinct…