Publications (20)
Is There Enhanced Depletion of Gas-Phase Nitrogen in Moderately Reddened Lines of Sight?
Adam G. Jensen, Brian L. Rachford, Theodore P. Snow
We report on the abundance of interstellar neutral nitrogen (NI) for 30 sightlines, using data from the Far Ultraviolet Spectroscopic Explorer (FUSE) and the Hubble Space Telescope…
Linear Gas Dynamics in the Expanding Universe: Why the Jeans Scale does not Matter
Nickolay Y. Gnedin, Emily J. Baker, Thomas J. Bethell +9
We investigate the relationship between the dark matter and baryons in the linear regime. This relation is quantified by the so-called ``filtering scale''. We show that a simple ga…
No consistent atmospheric absorption detected for the ultra-hot Jupiter WASP-189 b
P. Wilson Cauley, Evgenya Shkolnik, Ilya Ilyin +3
We observed a partial transit of the ultra-hot Jupiter WASP-189 b with PEPSI on the LBT. We detect a highly variable transit signal in multiple atomic transitions, including H-alph…
The Variation of Magnesium Depletion with Line of Sight Conditions
Adam G. Jensen, Theodore P. Snow
In this paper we report on the gas-phase abundance of singly-ionized magnesium (Mg II) in 44 lines of sight, using data from the Hubble Space Telescope (HST). We measure Mg II colu…
Observational Properties of Rotationally Excited Molecular Hydrogen In Translucent Lines of Sight
Adam G. Jensen, Theodore P. Snow, George Sonneborn +1
The {\it Far Ultraviolet Spectroscopic Explorer} ({\it FUSE}) has allowed precise determinations of the column densities of molecular hydrogen ($\Hmol$) in Galactic lines of sight…
New Insights on Interstellar Gas-Phase Iron
Adam G. Jensen, Theodore P. Snow
In this paper, we report on the gas-phase abundance of singly-ionized iron (Fe II) for 51 lines of sight, using data from the Far Ultraviolet Spectroscopic Explorer (FUSE). Fe II c…
Evidence for abnormal H variability during near-transit observations of HD 189733 b
P. Wilson Cauley, Seth Redfield, Adam G. Jensen
Changes in levels of stellar activity can mimic absorption signatures in transmission spectra from circumplanetary material. The frequency and magnitude of these changes is thus im…
Abundances and Depletions of Interstellar Oxygen
Adam G. Jensen, Brian L. Rachford, Theodore P. Snow
We report on the abundance of interstellar neutral oxygen (OI) for 26 sightlines, using data from the Far Ultraviolet Spectroscopic Explorer (FUSE), the International Spectroscopic…
A decade of H transits for HD 189733 b: stellar activity versus absorption in the extended atmosphere
P. Wilson Cauley, Seth Redfield, Adam G. Jensen
HD 189733 b is one of the most well-studied exoplanets due to its large transit depth and host star brightness. The focus on this object has produced a number of high-cadence trans…
Atmospheric dynamics and the variable transit of KELT-9 b
P. Wilson Cauley, Evgenya L. Shkolnik, Ilya Ilyin +3
We present a spectrally and temporally resolved detection of the optical Mg I triplet at 7.8 in the extended atmosphere of the ultra-hot Jupiter KELT-9 b, adding to the list of…
The Interstellar Medium in the Kepler Search Volume
Marshall C. Johnson, Seth Redfield, Adam G. Jensen
The properties of the interstellar medium (ISM) surrounding a planetary system can impact planetary climate through a number of mechanisms, including changing the size of the astro…
A Survey of Alkali Line Absorption in Exoplanetary Atmospheres
Adam G. Jensen, Seth Redfield, Michael Endl +3
We obtained over 90 hours of spectroscopic observations of four exoplanetary systems with the Hobby-Eberly Telescope (HET). Observations were taken in transit and out of transit, a…
Exoplanet Science Priorities from the Perspective of Internal and Surface Processes for Silicate and Ice Dominated Worlds
Wade G. Henning, Joseph P. Renaud, Avi M. Mandell +35
The geophysics of extrasolar planets is a scientific topic often regarded as standing largely beyond the reach of near-term observations. This reality in no way diminishes the cent…
A search for H absorption around KELT-3 b and GJ 436 b
P. Wilson Cauley, Seth Redfield, Adam G. Jensen
Observations of extended atmospheres around hot planets have generated exciting results concerning the dynamics of escaping planetary material. The configuration of the escaping pl…
Optical hydrogen absorption consistent with a thin bow shock leading the hot Jupiter HD 189733b
P. Wilson Cauley, Seth Redfield, Adam G. Jensen +3
Bow shocks are ubiquitous astrophysical phenomena resulting from the supersonic passage of an object through a gas. Recently, pre-transit absorption in UV metal transitions of the…
Variation in the pre-transit Balmer line signal around the hot Jupiter HD 189733 b
P. Wilson Cauley, Seth Redfield, Adam G. Jensen +1
As followup to our recent detection of a pre-transit signal around HD 189733 b, we obtained full pre-transit phase coverage of a single planetary transit. The pre-transit signal is…
A New FUSE Survey of Interstellar HD
Theodore P. Snow, Teresa L. Ross, Joshua D. Destree +5
We have used archival FUSE data to complete a survey of interstellar HD in 41 lines of sight with a wide range of extinctions. This follow up to an earlier survey was made to furth…
The Need for Laboratory Work to Aid in The Understanding of Exoplanetary Atmospheres
Jonathan J. Fortney, Tyler D. Robinson, Shawn Domagal-Goldman +31
Advancements in our understanding of exoplanetary atmospheres, from massive gas giants down to rocky worlds, depend on the constructive challenges between observations and models.…
Hydrogen and Sodium Absorption in the Optical Transmission Spectrum of WASP-12b
Adam G. Jensen, P. Wilson Cauley, Seth Redfield +2
We have obtained hours of medium resolution () spectroscopic exposures on the transiting exoplanet host star WASP-12, including hours while its planet,…
A Detection Of H-alpha In An Exoplanetary Exosphere
Adam G. Jensen, Seth Redfield, Michael Endl +3
We report on a search for H-alpha absorption in four exoplanets. Strong features at H-alpha are observed in the transmission spectra of both HD 189733b and HD 209458b. We attempt t…