C. von Essen
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View article: Geometric albedos at short optical wavelengths for the hot Jupiters WASP-43b, WASP-103b, and TrES-3b
Geometric albedos at short optical wavelengths for the hot Jupiters WASP-43b, WASP-103b, and TrES-3b Open
The largest and most close-in exoplanets would reflect enough star light to enable its ground-based photometric detection under the condition of a high to moderate albedo. We present the results of an observing campaign of secondary eclips…
View article: Geometric Albedos at Short Optical Wavelengths for the Hot Jupiters WASP-43b, WASP-103b, and TrES-3b
Geometric Albedos at Short Optical Wavelengths for the Hot Jupiters WASP-43b, WASP-103b, and TrES-3b Open
The largest and most close-in exoplanets would reflect enough starlight to enable its ground-based photometric detection under the condition of a high to moderate albedo. We present the results of an observing campaign of secondary eclipse…
View article: Chemical Composition of Bright Stars in the Northern Hemisphere: Star–Planet Connection
Chemical Composition of Bright Stars in the Northern Hemisphere: Star–Planet Connection Open
In fulfilling the aims of the planetary and asteroseismic research missions, such as that of the NASA Transiting Exoplanet Survey Satellite (TESS) space telescope, accurate stellar atmospheric parameters and a detailed chemical composition…
View article: TESS Data for Asteroseismology: Photometry
TESS Data for Asteroseismology: Photometry Open
Over the last two decades, asteroseismology has increasingly proven to be the observational tool of choice for the study of stellar physics, aided by the high quality of data available from space-based missions such as CoRoT, Kepler , K2, …
View article: Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy
Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy Open
Consideration of both low- and high-resolution transmission spectroscopy is key for obtaining a comprehensive picture of exoplanet atmospheres. In studies of transmission spectra, the continuum information is well established with low-reso…
View article: Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy
Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy Open
Consideration of both low- and high-resolution transmission spectroscopy is key for obtaining a comprehensive picture of exoplanet atmospheres. In studies of transmission spectra, the continuum information is well established with low-reso…
View article: Atmospheric Transmission Spectroscopy of Hot Jupiter KELT-10b using Synthetic Telluric Correction Software
Atmospheric Transmission Spectroscopy of Hot Jupiter KELT-10b using Synthetic Telluric Correction Software Open
High-resolution spectroscopic visible data were obtained with the Ultraviolet and Visible Echelle Spectrograph on the Very Large Telescope. Our goal was to analyze the data in an effort to detect the presence of sodium in the atmosphere of…
View article: Erratum: Large-scale changes of the cloud coverage in the ϵ Indi Ba and Bb system
Erratum: Large-scale changes of the cloud coverage in the ϵ Indi Ba and Bb system Open
View article: TESS unveils the optical phase curve of KELT-1b:Thermal emission and ellipsoidal variation from the brown dwarf companion along with the stellar activity
TESS unveils the optical phase curve of KELT-1b:Thermal emission and ellipsoidal variation from the brown dwarf companion along with the stellar activity Open
We present the detection and analysis of the phase curve of KELT-1b at optical wavelengths, analyzing data taken by the Transiting Exoplanet Survey Satellite (TESS) during cycle 2 and sector 17. With a mass of ~27 MJup, KELT-1b is an examp…
View article: TESS unveils the optical phase curve of KELT-1b
TESS unveils the optical phase curve of KELT-1b Open
We present the detection and analysis of the phase curve of KELT-1b at optical wavelengths, analyzing data taken by the Transiting Exoplanet Survey Satellite (TESS) during cycle 2 and sector 17. With a mass of ~27 M Jup , KELT-1b is an exa…
View article: Probing the atmosphere of HD189733b with the Na i and K i lines
Probing the atmosphere of HD189733b with the Na i and K i lines Open
High spectral resolution transmission spectroscopy is a powerful tool to characterize exoplanet atmospheres. Especially for hot Jupiters, this technique is highly relevant, due to their high-altitude absorption, e.g. from resonant sodium (…
View article: OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk
OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk Open
We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the Spitzer satellite in a solar orbit. At high magnification, the anomaly in the light curve was d…
View article: Tess data for asteroseismology: Timing verification
Tess data for asteroseismology: Timing verification Open
The Transiting Exoplanet Survey Satellite (TESS) is NASA´s latest space telescope dedicated to the discovery of transiting exoplanets around nearby stars. Besides the main goal of the mission, asteroseismology is an important secondary goa…
View article: TESS unveils the optical phase curve of KELT-1b. Thermal emission and ellipsoidal variation from the brown dwarf companion, and activity from the star
TESS unveils the optical phase curve of KELT-1b. Thermal emission and ellipsoidal variation from the brown dwarf companion, and activity from the star Open
We present the detection and analysis of the phase curve of KELT-1b at optical wavelengths, analyzing data taken by the Transiting Exoplanet Survey Satellite (TESS). With a mass of ~27 M_J, KELT-1b is a low-mass brown dwarf. Due to the hig…
View article: Large-scale changes of the cloud coverage in the ϵ Indi Ba and Bb system
Large-scale changes of the cloud coverage in the ϵ Indi Ba and Bb system Open
We present the results of 14 nights of I-band photometric monitoring of the nearby brown dwarf binary, ϵ Indi Ba and Bb. Observations were acquired over 2 months, with a total of close to 42 h of coverage at a typically high cadence of 1.4…
View article: TESS unveils the phase curve of WASP-33b
TESS unveils the phase curve of WASP-33b Open
We present the detection and characterization of the full-orbit phase curve and secondary eclipse of the ultra-hot Jupiter WASP-33b at optical wavelengths, along with the pulsation spectrum of the host star. We analyzed data collected by t…
View article: HST/STIS transmission spectrum of the ultra-hot Jupiter WASP-76 b confirms the presence of sodium in its atmosphere
HST/STIS transmission spectrum of the ultra-hot Jupiter WASP-76 b confirms the presence of sodium in its atmosphere Open
We present an atmospheric transmission spectrum of the ultra-hot Jupiter WASP-76 b by analyzing archival data obtained with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). The dataset spans three …
View article: TESS unveils the phase curve of WASP-33b. Characterization of the planetary atmosphere and the pulsations from the star
TESS unveils the phase curve of WASP-33b. Characterization of the planetary atmosphere and the pulsations from the star Open
We present the detection and characterization of the full-orbit phase curve and secondary eclipse of the ultra-hot Jupiter WASP-33b at optical wavelengths, along with the pulsation spectrum of the host star. We analyzed data collected by t…
View article: High-resolution Spectroscopic Study of Dwarf Stars in the Northern Sky: Lithium, Carbon, and Oxygen Abundances
High-resolution Spectroscopic Study of Dwarf Stars in the Northern Sky: Lithium, Carbon, and Oxygen Abundances Open
Abundances of lithium, carbon, and oxygen have been derived using spectral synthesis for a sample of 249 bright F, G, and K Northern Hemisphere dwarf stars from the high-resolution spectra acquired with the VUES spectrograph at the Molėtai…
View article: Transit timing variations in the WASP-4 planetary system
Transit timing variations in the WASP-4 planetary system Open
Transits in the planetary system WASP-4 were recently found to occur 80 s earlier than expected in observations from the TESS satellite. We present 22 new times of mid-transit that confirm the existence of transit timing variations, and ar…
View article: The potassium absorption on HD189733b and HD209458b
The potassium absorption on HD189733b and HD209458b Open
In this work, we investigate the potassium excess absorption around 7699 Å of the exoplanets HD189733b and HD209458b. For this purpose, we used high-spectral resolution transit observations acquired with the 2 × 8.4 m Large Binocular Teles…
View article: Kepler Object of Interest Network III. Kepler-82f: A new non-transiting $21 M_\bigoplus$ planet from photodynamical modelling
Kepler Object of Interest Network III. Kepler-82f: A new non-transiting $21 M_\bigoplus$ planet from photodynamical modelling Open
Context. The Kepler Object of Interest Network (KOINet) is a multi-site network of telescopes around the globe organised for follow-up observations of transiting planet candidate Kepler objects of interest (KOIs) with large transit timing …
View article: Indications for transit-timing variations in the exo-Neptune HAT-P-26b
Indications for transit-timing variations in the exo-Neptune HAT-P-26b Open
Upon its discovery, the low-density transiting Neptune HAT-P-26b showed a 2.1 σ detection drift in its spectroscopic data, while photometric data showed a weak curvature in the timing residuals, the confirmation of which required further f…
View article: Low albedos of hot to ultra-hot Jupiters in the optical to near-infrared transition regime
Low albedos of hot to ultra-hot Jupiters in the optical to near-infrared transition regime Open
The depth of a secondary eclipse contains information of both the thermally emitted light component of a hot Jupiter and the reflected light component. If the day side atmosphere of the planet is assumed to be isothermal, it is possible to…
View article: Dual-Beam Optical Linear Polarimetry from Southern Skies. Characterisation of CasPol for high precision polarimetry
Dual-Beam Optical Linear Polarimetry from Southern Skies. Characterisation of CasPol for high precision polarimetry Open
We present a characterization of CasPol, a dual-beam polarimeter mounted at the 2.15 meter Jorge Sahade Telescope, located at the Complejo Astronómico El Leoncito, Argentina. The telescope is one of the few available meter-sized optical te…
View article: An optical transmission spectrum of the ultra-hot Jupiter WASP-33 b
An optical transmission spectrum of the ultra-hot Jupiter WASP-33 b Open
There has been increasing progress toward detailed characterization of exoplanetary atmospheres, in both observations and theoretical methods. Improvements in observational facilities and data reduction and analysis techniques are enabling…
View article: Ephemeris refinement of 21 hot Jupiter exoplanets with high timing uncertainties
Ephemeris refinement of 21 hot Jupiter exoplanets with high timing uncertainties Open
\nTransit events of extrasolar planets offer a wealth of information for planetary characterization. However, for many known targets, the uncertainty of their predicted transit windows prohibits an accurate scheduling of follow-up observat…
View article: Estudio de atmósferas exoplanetarias por medio de espectroscopía de baja resolución
Estudio de atmósferas exoplanetarias por medio de espectroscopía de baja resolución Open
El objetivo principal del plan de Doctorado es contribuir con el estudio y la caracterización de las atmósferas exoplanetarias, en otras palabras, una mirada cercana a la estructuración de las atmósferas de planetas como los de nuestro Sis…
View article: Kepler Object of Interest Network: III. Kepler-82f: a new non-transiting 21 M⊕ planet from photodynamical modelling
Kepler Object of Interest Network: III. Kepler-82f: a new non-transiting 21 M⊕ planet from photodynamical modelling Open
Context. The Kepler Object of Interest Network (KOINet) is a multi-site network of telescopes around the globe organised for follow-up observations of transiting planet candidate Kepler objects of interest with large transit timing variati…
View article: Planet-star interactions with precise transit timing. I. The refined orbital decay rate for WASP-12 b and initial constraints for HAT-P-23 b, KELT-1 b, KELT-16 b, WASP-33 b, and WASP-103 b
Planet-star interactions with precise transit timing. I. The refined orbital decay rate for WASP-12 b and initial constraints for HAT-P-23 b, KELT-1 b, KELT-16 b, WASP-33 b, and WASP-103 b Open
Theoretical calculations and some indirect observations show that massive exoplanets on tight orbits must decay due to tidal dissipation within their host stars. This orbital evolution could be observationally accessible through precise tr…