Seth Redfield

Publications : 218
Aldex : 90
H-index : 40
Citations : 5720

science

The local ISM in three dimensions: kinematics, morphology and physical properties

Jeffrey L. Linsky, Seth Redfield

May 13, 2014 in Astrophysics and Space Science
We summarize the results of our long-term program to study the kinematics, morphology, and physical properties of warm partially ionized interstellar gas located within 100 pc of the Sun. Using the Space Telescope Imaging Spectrograph (STIS) and other spectrographs on the Hubble Space Telescope (HST), we measure radial velocities of neutral and singly ionized atoms that identify comoving structure...

Identification of carbon dioxide in an exoplanet atmosphere

The JWST...

Aug 24, 2022 in Arxiv
Carbon dioxide (CO2) is a key chemical species that is found in a wide range of planetary atmospheres. In the context of exoplanets, CO2 is an indicator of the metal enrichment (id est, elements heavier than helium, also called "metallicity"), and thus formation processes of the primary atmospheres of hot gas giants. It is also one of the most promising species to detect in the secondary atmospher...

medicine

Identification of carbon dioxide in an exoplanet atmosphere

Eva-Maria Ahrer et 131 al.

Sep 2, 2022 in Nature

The GAPS Programme at TNG XXXIX -- Multiple molecular species in the atmosphere of the warm giant planet WASP-80 b unveiled at high resolution with GIANO-B

Ilaria Carleo, Hristo Stoev et 30 al.

Jul 20, 2022 in Arxiv
Detections of molecules in the atmosphere of gas giant exoplanets allow us to investigate the physico-chemical properties of the atmospheres. Their inferred chemical composition is used as tracer of planet formation and evolution mechanisms. Currently, an increasing number of detections is showing a possible rich chemistry of the hotter gaseous planets, but whether this extends to cooler giants is...

Inhomogeneity in the Local ISM and its Relation to the Heliosphere

Jeffrey Linsky et 4 al.

Mar 24, 2022 in Arxiv
This paper reviews past research and new studies underway of the local interstellar environment and its changing influence on the heliosphere. The size, shape, and physical properties of the heliosphere outside of the heliopause are determined by the surrounding environment - now the outer region of the Local Interstellar Cloud (LIC). Analysis of high-resolution HST spectra led to a kinematic mode...

TOI-2046b, TOI-1181b and TOI-1516b, three new hot Jupiters from \textit{TESS}: planets orbiting a young star, a subgiant and a normal star

Petr Kabáth et 57 al.

May 4, 2022 in Arxiv
We present the confirmation and characterization of three hot Jupiters, TOI-1181b, TOI-1516b, and TOI-2046b, discovered by the TESS space mission. The reported hot Jupiters have orbital periods between 1.4 and 2.05 days. The masses of the three planets are $1.18\pm0.14$ M$_{\mathrm{J}}$, $3.16\pm0.12$\, M$_{\mathrm{J}}$, and 2.30 $\pm 0.28$ M$_{\mathrm{J}}$, for TOI-1181b, TOI-1516b, and TOI-2046b...

A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system

Luisa Maria Serrano, Carl Ziegler et 49 al.

Apr 28, 2022 in Arxiv
It is commonly accepted that exoplanets with orbital periods shorter than 1 day, also known as ultra-short period (USP) planets, formed further out within their natal protoplanetary disk, before migrating to their current-day orbits via dynamical interactions. One of the most accepted theories suggests a violent scenario involving high-eccentricity migration followed by tidal circularization. Here...

astronomy

A low eccentricity migration pathway for a 13 h period Earth analogue in a four planet system

Luisa Maria Serrano, Carl Ziegler et 49 al.

Apr 28, 2022 in Nature Astronomy
It is commonly accepted that exoplanets with orbital periods shorter than one day, also known as ultra-short-period (USP) planets, formed further out within their natal protoplanetary disks before migrating to their current-day orbits via dynamical interactions. One of the most accepted theories suggests a violent scenario involving high-eccentricity migration followed by tidal circularization. He...

Inhomogeneity within Local Interstellar Clouds

Jeffrey L. Linsky et 4 al.

Apr 5, 2022 in Arxiv
Analysis of interstellar absorption lines observed in high-resolution {\em HST} spectra of nearby stars provides temperatures, turbulent velocities, and kinetic properties of warm interstellar clouds. Previous studies identified 15 warm partially ionized clouds within about 10~pc of the Sun and measured their mean thermal and kinematic properties. A new analysis of 100 interstellar velocity compon...

More Evidence for Variable Helium Absorption from HD 189733b

Michael Zhang et 8 al.

Apr 6, 2022 in Arxiv
We present a new Keck/NIRSPEC observation of metastable helium absorption from the upper atmosphere of HD 189733b, a hot Jupiter orbiting a nearby moderately active star. We measure an average helium transit depth of $0.420 \pm 0.013$% integrated over the [-20, 20] km/s velocity range. Comparing this measurement to eight previously published transit observations with different instruments, we find...

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