Emil Knudstrup
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View article: Precise mass and radius determination for two new and one known Neptune-sized planets around G Dwarf hosts
Precise mass and radius determination for two new and one known Neptune-sized planets around G Dwarf hosts Open
As part of the KESPRINT collaboration, we present the discovery and characterization of three exoplanets in the sub-Neptune to super-Neptune regime, spanning key regions of the exo-Neptunian landscape. TOI-1472 c and TOI-1648 b are newly d…
View article: A four-planet system orbiting the old thick disk star TOI-1203
A four-planet system orbiting the old thick disk star TOI-1203 Open
TOI-1203 is a bright (V,=,8.6) G3,V star known to host a transiting warm sub-Neptune on a 25.5-day orbit. Here we report on an intensive high-precision radial velocity and photometric follow-up campaign carried out with the spectrograph an…
View article: A four-planet system orbiting the old thick disk star TOI-1203
A four-planet system orbiting the old thick disk star TOI-1203 Open
TOI-1203 is a bright (V=8.6) G3 V star known to host a transiting warm sub-Neptune on a 25.5 d orbit. Here we report on an intensive high-precision radial velocity and photometric follow-up campaign carried out with the HARPS spectrograph …
View article: TOI-1438: A rare system with two short-period sub-Neptunes and a tentative long-period Jupiter-like planet orbiting a K0V star
TOI-1438: A rare system with two short-period sub-Neptunes and a tentative long-period Jupiter-like planet orbiting a K0V star Open
We present the detection and characterisation of the TOI-1438 multi-planet system discovered by the Transiting Exoplanet Survey Satellite (TESS). To confirm the planetary nature of the candidates and determine their masses, we collected a …
View article: Obliquities of Exoplanet Host Stars: 19 New and Updated Measurements, and Trends in the Sample of 205 Measurements
Obliquities of Exoplanet Host Stars: 19 New and Updated Measurements, and Trends in the Sample of 205 Measurements Open
Measurements of the obliquities in exoplanet systems have revealed some remarkable architectures, some of which are very different from the Solar System. Nearly 200 obliquity measurements have been obtained through observations of the Ross…
View article: The MOPYS project: A survey of 70 planets in search of extended He I and H atmospheres
The MOPYS project: A survey of 70 planets in search of extended He I and H atmospheres Open
During the first billion years of their life, exoplanet atmospheres are modified by different atmospheric escape phenomena that can strongly affect the shape and morphology of the exoplanet itself. These processes can be studied with Ly α …
View article: The TESS-Keck Survey XXI: 13 New Planets and Homogeneous Properties for 21 Subgiant Systems
The TESS-Keck Survey XXI: 13 New Planets and Homogeneous Properties for 21 Subgiant Systems Open
We present a dedicated transit and radial velocity survey of planets orbiting subgiant stars observed by the TESS Mission. Using $\sim$$16$ nights on Keck/HIRES, we confirm and characterize $12$ new transiting planets -- $\rm TOI-329\,b$, …
View article: TOI-544 b: a potential water-world inside the radius valley in a two-planet system
TOI-544 b: a potential water-world inside the radius valley in a two-planet system Open
We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V = 10.8), which hosts a small transiting planet recently discovered by the Transiting Exoplanet Survey Satellite (TESS). We collected 122 high-res…
View article: TOI-544 b: a potential water-world inside the radius valley in a two-planet system
TOI-544 b: a potential water-world inside the radius valley in a two-planet system Open
We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V=10.8), which hosts a small transiting planet recently discovered by the Transiting Exoplanet Survey Satellite (TESS). We collected 122 high-resol…
View article: Detection of atmospheric species and dynamics in the bloated hot Jupiter WASP-172 b with ESPRESSO
Detection of atmospheric species and dynamics in the bloated hot Jupiter WASP-172 b with ESPRESSO Open
Context. The population of strongly irradiated Jupiter-sized planets has no equivalent in the Solar System. It is characterised by strongly bloated atmospheres and large atmospheric scale heights. Recent space-based observations of SO 2 ph…
View article: Detection of atmospheric species and dynamics in the bloated hot Jupiter WASP-172~b with ESPRESSO
Detection of atmospheric species and dynamics in the bloated hot Jupiter WASP-172~b with ESPRESSO Open
The population of strongly irradiated Jupiter-sized planets has no equivalent in the Solar System. It is characterised by strongly bloated atmospheres and atmospheric large-scale heights. Recent space-based observations of SO2 photochemist…
View article: On the need of an ultramassive black hole in OJ 287
On the need of an ultramassive black hole in OJ 287 Open
The highly variable blazar OJ~287 is commonly discussed as an example of a binary black hole system. The 130 year long optical light curve is well explained by a model where the central body is a massive black hole of 18.35$\times$10$^9$ s…
View article: Observational Implications of OJ 287’s Predicted 2022 Disk Impact in the Black Hole Binary Model
Observational Implications of OJ 287’s Predicted 2022 Disk Impact in the Black Hole Binary Model Open
We present a summary of the results of the OJ 287 observational campaign, which was carried out during the 2021/2022 observational season. This season is special in the binary model because the major axis of the precessing binary happens t…
View article: On the need of an ultramassive black hole in OJ 287
On the need of an ultramassive black hole in OJ 287 Open
The highly variable blazar OJ 287 is commonly discussed as an example of a binary black hole system. The 130 yr long optical light curve is well explained by a model where the central body is a massive black hole of 18.35 $\times$ 109 sola…
View article: A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS
A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS Open
We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. HD 221416 b (HIP 116158, TOI-197) is a bright (V =…
View article: A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776
A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776 Open
We report the discovery and characterization of two transiting planets around the bright M1 V star LP 961-53 (TOI-776, J = 8.5 mag, M = 0.54 ± 0.03 M⊙) detected during Sector 10 observations of the Transiting Exoplanet Survey Satellite (TE…
View article: Observational Implications of OJ 287’s Predicted 2022 Disk Impact in the Black Hole Binary Model
Observational Implications of OJ 287’s Predicted 2022 Disk Impact in the Black Hole Binary Model Open
We present a summary of the results of the OJ 287 observational campaign, which was carried out during the 2021/2022 observational season. This season is special in the binary model because the major axis of the precessing binary happens t…
View article: Solar-like oscillations in<i>γ</i>Cephei A as seen through SONG and TESS
Solar-like oscillations in<i>γ</i>Cephei A as seen through SONG and TESS Open
Context. Fundamental stellar parameters such as mass and radius are some of the most important building blocks in astronomy, both when it comes to understanding the star itself and when deriving the properties of any exoplanet(s) they may …
View article: TOI-1130: A photodynamical analysis of a hot Jupiter in resonance with an inner low-mass planet
TOI-1130: A photodynamical analysis of a hot Jupiter in resonance with an inner low-mass planet Open
The TOI-1130 is a known planetary system around a K-dwarf consisting of a gas giant planet, TOI-1130 c on an 8.4-day orbit that is accompanied by an inner Neptune-sized planet, TOI-1130 b, with an orbital period of 4.1 days. We collected p…
View article: The planetary system around HD 190622 (TOI-1054)
The planetary system around HD 190622 (TOI-1054) Open
Context . Giant planets are known to dominate the long-term stability of planetary systems due to their prevailing gravitational interactions, but they are also thought to play an important role in planet formation. Observational constrain…
View article: Refining the 2022 OJ 287 impact flare arrival epoch
Refining the 2022 OJ 287 impact flare arrival epoch Open
The bright blazar OJ~287 routinely parades high brightness bremsstrahlung flares, which are explained as being a result of a secondary supermassive black hole (SMBH) impacting the accretion disc of a more massive primary SMBH in a binary s…
View article: Refining the OJ 287 2022 impact flare arrival epoch
Refining the OJ 287 2022 impact flare arrival epoch Open
The bright blazar OJ 287 routinely parades high brightness bremsstrahlung flares, which are explained as being a result of a secondary supermassive black hole (SMBH) impacting the accretion disc of a more massive primary SMBH in a binary s…
View article: An Earth-sized Planet around an M5 Dwarf Star at 22 pc
An Earth-sized Planet around an M5 Dwarf Star at 22 pc Open
We report on the discovery of an Earth-sized transiting planet ( R p = 1.015 ± 0.051 R ⊕ ) in a P = 4.02 day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The planet candidate was first identified by analyzing the light-curve…
View article: An Earth-sized Planet around an M5 Dwarf Star at 22 pc
An Earth-sized Planet around an M5 Dwarf Star at 22 pc Open
We report on the discovery of an Earth-sized transiting planet ($R_p=1.015\pm0.051\,R_\oplus$) in a $P=4.02$ day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The planet candidate was first identified by analyzing the light c…
View article: A puffy polar planet
A puffy polar planet Open
TOI-640 b is a hot, puffy Jupiter with a mass of 0.57 ± 0.02 M J and radius of 1.72 ± 0.05 R J , orbiting a slightly evolved F-type star with a separation of 6.33 −0.06 +0.07 R ⋆ . Through spectroscopic in-transit observations made with th…
View article: TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain
TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain Open
Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMRs). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TO…
View article: Radial velocity confirmation of a hot super-Neptune discovered by TESS with a warm Saturn–mass companion
Radial velocity confirmation of a hot super-Neptune discovered by TESS with a warm Saturn–mass companion Open
We report the discovery and confirmation of the planetary system TOI-1288. This late G dwarf harbours two planets: TOI-1288 b and TOI-1288 c. We combine TESS space-borne and ground-based transit photometry with HARPS-N and HIRES high-preci…
View article: TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain
TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain Open
Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMR). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TOI…
View article: Refining the prediction for OJ 287 next impact flare arrival epoch
Refining the prediction for OJ 287 next impact flare arrival epoch Open
The bright blazar OJ~287 routinely parades high brightness bremsstrahlung flares which are explained as being a result of a secondary supermassive black hole (SMBH) impacting the accretion disk of a primary SMBH in a binary system. We begi…
View article: The TESS–Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras
The TESS–Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras Open
We report the detection of a Saturn-size exoplanet orbiting HD 332231 (TOI
\n1456) in light curves from the Transiting Exoplanet Survey Satellite (TESS). HD
\n332231, an F8 dwarf star with a V-band magnitude of 8.56, was observed by TESS
\…