Search Publications
Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b
Deming, Drake; Madhusudhan, Nikku; Gandhi, Siddharth +4 more
We find evidence for a strong thermal inversion in the dayside atmosphere of the highly irradiated hot Jupiter WASP-18b ({T}{eq}=2411 {{K}}, M=10.3 {M}J) based on emission spectroscopy from Hubble Space Telescope secondary eclipse observations and Spitzer eclipse photometry. We demonstrate a lack of water vapor in either abso…
Characterizing Intracluster Light in the Hubble Frontier Fields
Schmidt, Kasper B.; Treu, Tommaso; Vulcani, Benedetta +3 more
We investigate the intracluster light (ICL) in the six Hubble Frontier Field clusters at 0.3< z< 0.6. We employ a new method, which is free from any functional form of the ICL profile, and exploit the unprecedented depth of this Hubble Space Telescope imaging to map the ICL’s diffuse light out to clustrocentric radii R∼ 300 {kpc} ({µ }…
Extremely Small Sizes for Faint z ∼ 2-8 Galaxies in the Hubble Frontier Fields: A Key Input for Establishing Their Volume Density and UV Emissivity
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +3 more
We provide the first observational constraints on the sizes of the faintest galaxies lensed by the Hubble Frontier Fields (HFF) clusters. Ionizing radiation from faint galaxies likely drives cosmic reionization, and the HFF initiative provides a key opportunity to find such galaxies. However, we cannot assess their ionizing emissivity without a ro…
Panchromatic Hubble Andromeda Treasury. XVIII. The High-mass Truncation of the Star Cluster Mass Function
Dolphin, Andrew E.; Williams, Benjamin F.; Johnson, L. Clifton +7 more
We measure the mass function for a sample of 840 young star clusters with ages between 10 and 300 Myr observed by the Panchromatic Hubble Andromeda Treasury (PHAT) survey in M31. The data show clear evidence of a high-mass truncation: only 15 clusters more massive than {10}4 {M}⊙ are observed, compared to the ∼100 expected f…
The Herschel Orion Protostar Survey: Luminosity and Envelope Evolution
Manoj, P.; Myers, Philip C.; Fischer, William J. +12 more
The Herschel Orion Protostar Survey obtained well-sampled 1.2-870 µm spectral energy distributions (SEDs) of over 300 protostars in the Orion molecular clouds, home to most of the young stellar objects (YSOs) in the nearest 500 pc. We plot the bolometric luminosities and temperatures for 330 Orion YSOs, 315 of which have bolometric temperatu…
Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation
Fontaine, G.; Bergeron, P.; Bédard, A.
We present a detailed spectroscopic and photometric analysis of 219 DA and DB white dwarfs for which trigonometric parallax measurements are available. Our aim is to compare the physical parameters derived from the spectroscopic and photometric techniques, and then to test the theoretical mass-radius relation for white dwarfs using these results. …
Magnifying the Early Episodes of Star Formation: Super Star Clusters at Cosmological Distances
Castellano, M.; Pentericci, L.; Vignali, C. +27 more
We study the spectrophotometric properties of a highly magnified (µ ≃ 40{--}70) pair of stellar systems identified at z = 3.2222 behind the Hubble Frontier Field galaxy cluster MACS J0416. Five multiple images (out of six) have been spectroscopically confirmed by means of VLT/MUSE and VLT/X-Shooter observations. Each image includes two faint…
Chromosphere to 1 AU Simulation of the 2011 March 7th Event: A Comprehensive Study of Coronal Mass Ejection Propagation
de Koning, C. A.; Gombosi, T. I.; Tóth, G. +5 more
We perform and analyze the results of a global magnetohydrodynamic simulation of the fast coronal mass ejection (CME) that occurred on 2011 March 7. The simulation is made using the newly developed Alfvén Wave Solar Model (AWSoM), which describes the background solar wind starting from the upper chromosphere and extends to 24 R⊙. Coupli…
The Greater Taurus-Auriga Ecosystem. I. There is a Distributed Older Population
Herczeg, Gregory J.; Rizzuto, Aaron C.; Kraus, Adam L. +5 more
The census of Taurus-Auriga has been assembled over seven decades and inherited the biases and incompleteness of the input studies. The unusual shape of its inferred initial mass function (IMF) and the existence of isolated disk-bearing stars suggest that additional (likely disk-free) members remain to be discovered. We therefore have begun a glob…
Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548
Im, M.; Geier, S.; Zheng, W. +90 more
We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves (1158 \mathringA to 9157 \mathringA ) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 J…