Johanna Teske
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View article: Constraining exoplanet interiors using observations of their atmospheres
Constraining exoplanet interiors using observations of their atmospheres Open
Astronomical surveys have identified numerous exoplanets with bulk compositions that are unlike the planets of the Solar System, including rocky super-Earths and gas-enveloped sub-Neptunes. Observing the atmospheres of these objects provid…
View article: The OATMEAL Survey. III. An Aligned Transiting Warm Brown Dwarf and Evidence for Quiescent Brown Dwarf Migration
The OATMEAL Survey. III. An Aligned Transiting Warm Brown Dwarf and Evidence for Quiescent Brown Dwarf Migration Open
We present the first measurement of the sky-projected orbital obliquity of a benchmark transiting brown dwarf host, HIP 33609, as a part of the Orbital Architectures of Transiting Massive Exoplanets And Low-mass stars (OATMEAL) survey. HIP…
View article: A Thick Volatile Atmosphere on the Ultra-Hot Super-Earth TOI-561 b
A Thick Volatile Atmosphere on the Ultra-Hot Super-Earth TOI-561 b Open
Ultra-short period (USP) exoplanets -- with $R_p \leq 2~$R$_{\oplus}$ and periods $\leq$1 day -- are expected to be stripped of volatile atmospheres by intense host star irradiation, which is corroborated by their nominal bulk densities an…
View article: JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b
JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b Open
We present JWST NIRSpec/G395H transmission spectroscopy observations of GJ 357 b, a warm ( T eq ≈ 525 K) super-Earth (1.2 R ⊕ , 1.84 M ⊕ ) orbiting a nearby M3-type star, with a median precision of 18 ppm and 27 ppm in NRS1 and NRS2, respe…
View article: Searching for GEMS: The Occurrence of Giant Planets orbiting M-dwarfs within 100 pc
Searching for GEMS: The Occurrence of Giant Planets orbiting M-dwarfs within 100 pc Open
We present results from a systematic search for transiting short-period Giant Exoplanets around M-dwarf Stars (GEMS; $P < 10$ days, $R_p \gtrsim 8~R_\oplus$) within a distance-limited 100\,pc sample of 149,316 M-dwarfs using TESS-Gaia Ligh…
View article: The SPACE Program
The SPACE Program Open
Sub-Neptune exoplanets are the most abundant type of planet known today. As they do not have a Solar System counterpart, many open questions exist about their composition and formation. Previous spectroscopic studies have ruled out aerosol…
View article: Planets Around Solar Twins/Analogs (PASTA)
Planets Around Solar Twins/Analogs (PASTA) Open
Context . Previous studies have suggested that the Sun is relatively depleted in refractory elements compared to other solar twins or analogs, potentially as a result of planet formation. However, such conclusions are often limited by inho…
View article: An Eccentric Sub-Neptune Moving Into the Evaporation Desert<sup>*</sup>
An Eccentric Sub-Neptune Moving Into the Evaporation Desert<sup>*</sup> Open
Though missions such as Kepler, K2, and TESS have discovered >2000 sub-Neptune and Neptunian planets, there is a dearth of such planets at close-in ( P ≲ 3 days) orbits. This feature, called the Neptune desert or the evaporation desert, is…
View article: HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth
HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth Open
We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by Pl…
View article: On Linking Planet Formation Models, Protoplanetary Disk Properties, and Mature Gas Giant Exoplanet Atmospheres
On Linking Planet Formation Models, Protoplanetary Disk Properties, and Mature Gas Giant Exoplanet Atmospheres Open
Measuring a single elemental ratio (e.g., carbon-to-oxygen) provides insufficient information for understanding the formation mechanisms and evolution that affect our observations of gas giant planet atmospheres. Although the fields of pla…
View article: Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94 A b using <i>JWST</i> NIRSpec/G395H
Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94 A b using <i>JWST</i> NIRSpec/G395H Open
The discovery of hot Jupiters that orbit very close to their host stars has long challenged traditional models of planetary formation and migration. Characterizing their atmospheric composition – mainly in the form of the carbon-to-oxygen …
View article: TOI-6695: A Pair of Near-resonant Massive Planets Observed with TESS from the WINE Survey*
TOI-6695: A Pair of Near-resonant Massive Planets Observed with TESS from the WINE Survey* Open
We present the discovery and characterization of a pair of warm Jovian-mass exoplanets orbiting the Sun-like star TOI-6695, based on Transiting Exoplanet Survey Satellite (TESS) transits and precise radial velocity (RV) measurements obtain…
View article: HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth
HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth Open
We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star, HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by P…
View article: TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf
TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf Open
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 ± 0.041 R ⊕ ) ultra-short-period (USP) planet orbiting a nearby (∼20 pc) M dwarf. Using the newly commissioned Keck Planet Finder spectrograph, we have measured the mass of TO…
View article: Abundance analysis of stars hosting gas-rich debris discs
Abundance analysis of stars hosting gas-rich debris discs Open
Context. Accretion from protoplanetary or debris discs can contaminate the stellar photosphere, especially in stars that have radiative envelopes. Due to the relatively slower photospheric mixing, these stars can exhibit clear contaminatio…
View article: JWST COMPASS: NIRSpec/G395H Transmission Observations of TOI-776 c, a 2 <i>R</i> <sub>⊕</sub> M Dwarf Planet
JWST COMPASS: NIRSpec/G395H Transmission Observations of TOI-776 c, a 2 <i>R</i> <sub>⊕</sub> M Dwarf Planet Open
The atmospheres of planets between the size of Earth and Neptune at short orbital periods have been under intense scrutiny. Of the approximately dozen planets in this regime with atmospheres studied so far, a few appear to have prominent m…
View article: The Super-puff WASP-193 b is on a Well-aligned Orbit*
The Super-puff WASP-193 b is on a Well-aligned Orbit* Open
The “super-puffs” are a population of planets that have masses comparable to that of Neptune but radii similar to Jupiter, leading to extremely low bulk densities ( ρ p ≲ 0.2 g cm −3 ) that are not easily explained by standard core accreti…
View article: The Super-Puff WASP-193b is On A Well-Aligned Orbit
The Super-Puff WASP-193b is On A Well-Aligned Orbit Open
The "super-puffs" are a population of planets that have masses comparable to that of Neptune but radii similar to Jupiter, leading to extremely low bulk densities ($ρ_p \lesssim 0.2\,\mathrm{g}\,\mathrm{cm}^{-3}$) that are not easily expla…
View article: TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf
TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf Open
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 $\pm$ 0.041 R$_\oplus$) ultra-short-period (USP) planet orbiting a nearby ($\sim$20 pc) M dwarf. Using the newly commissioned Keck Planet Finder (KPF) spectrograph, we have me…
View article: Planets Around Solar Twins/Analogs (PASTA). I. High-precision Stellar Chemical Abundances for 17 Planet-hosting Stars and the Condensation Temperature Trend*
Planets Around Solar Twins/Analogs (PASTA). I. High-precision Stellar Chemical Abundances for 17 Planet-hosting Stars and the Condensation Temperature Trend* Open
The Sun is depleted in refractory elements compared to nearby solar twins, which may be linked to the formation of giant or terrestrial planets. Here we present high-resolution, high signal-to-noise spectroscopic data for 17 solar-like sta…
View article: JWST COMPASS: NIRSpec/G395H Transmission Observations of the Super-Earth TOI-776 b
JWST COMPASS: NIRSpec/G395H Transmission Observations of the Super-Earth TOI-776 b Open
We present two transit observations of the ∼520 K, 1.85 R ⊕ , 4.0 M ⊕ super-Earth TOI-776 b with JWST NIRSpec/G395H, resulting in a 2.8–5.2 μ m transmission spectrum. Producing reductions using the ExoTiC-JEDI and Eureka! pipelines, we obt…
View article: GEMS JWST: Transmission spectroscopy of TOI-5205b reveals significant stellar contamination and a metal-poor atmosphere
GEMS JWST: Transmission spectroscopy of TOI-5205b reveals significant stellar contamination and a metal-poor atmosphere Open
Recent discoveries of transiting giant exoplanets around M dwarfs (GEMS) present an opportunity to investigate their atmospheric compositions and explore how such massive planets can form around low-mass stars contrary to canonical formati…
View article: The NCORES programme: precise planetary masses, null results, and insight into the planet mass distribution near the radius gap
The NCORES programme: precise planetary masses, null results, and insight into the planet mass distribution near the radius gap Open
NCORES was a large observing programme on the ESO HARPS spectrograph, dedicated to measuring the masses of Neptune-like and smaller transiting planets discovered by the TESS satellite using the radial velocity technique. This paper present…
View article: The NCORES Program: Precise planetary masses, null results, and insight into the planet mass distribution near the radius gap
The NCORES Program: Precise planetary masses, null results, and insight into the planet mass distribution near the radius gap Open
NCORES was a large observing program on the ESO HARPS spectrograph, dedicated to measuring the masses of Neptune-like and smaller transiting planets discovered by the TESS satellite using the radial velocity technique. This paper presents …
View article: Three warm Jupiters orbiting TOI-6628, TOI-3837, and TOI-5027 and one sub-Saturn orbiting TOI-2328
Three warm Jupiters orbiting TOI-6628, TOI-3837, and TOI-5027 and one sub-Saturn orbiting TOI-2328 Open
We report the discovery and characterization of three new transiting giant planets orbiting TOI-6628, TOI-3837, and TOI-5027 and one new warm sub-Saturn orbiting TOI-2328, whose transits events were detected in the light curves of the Tran…
View article: TESS Giants Transiting Giants. VII. A Hot Saturn Orbiting an Oscillating Red Giant Star*
TESS Giants Transiting Giants. VII. A Hot Saturn Orbiting an Oscillating Red Giant Star* Open
We present the discovery of TOI-7041 b (TIC 201175570b), a hot Saturn transiting a red giant star with measurable stellar oscillations. We observe solar-like oscillations in TOI-7041 with a frequency of maximum power of 218.50±2.23 …
View article: Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994*
Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994* Open
We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite. TOI-4994b transits a G-type star ( V = 12.6 mag) with a mass, radius, and…
View article: Reliable Detections of Atmospheres on Rocky Exoplanets with Photometric JWST Phase Curves
Reliable Detections of Atmospheres on Rocky Exoplanets with Photometric JWST Phase Curves Open
The prevalence of atmospheres on rocky planets is one of the major questions in exoplanet astronomy, but there are currently no published unambiguous detections of atmospheres on any rocky exoplanets. The MIRI instrument on JWST can measur…
View article: Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581*
Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581* Open
We report the validation of multiple planets transiting the nearby ( d = 12.8 pc) K5V dwarf HD 101581 (GJ 435, TOI–6276, TIC 397362481). This system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion…
View article: Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581
Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581 Open
We report the validation of multiple planets transiting the nearby ($d = 12.8$ pc) K5V dwarf HD 101581 (GJ 435, TOI-6276, TIC 397362481). The system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion…