X. Alexoudi
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View article: Comparative study of nearly‐grazing and fully‐grazing exoplanet system parameters derived with <scp>TESS</scp> and ground‐based instruments
Comparative study of nearly‐grazing and fully‐grazing exoplanet system parameters derived with <span>TESS</span> and ground‐based instruments Open
Grazing transiting systems are rare and difficult to parameterize due to their partial transit geometry. We investigated a sample of 43 nearly‐grazing to fully‐grazing transiting exoplanetary systems, using datasets provided by the Transit…
View article: The PEPSI exoplanet transit survey (PETS) I: investigating the presence of a silicate atmosphere on the super-earth 55 Cnc e
The PEPSI exoplanet transit survey (PETS) I: investigating the presence of a silicate atmosphere on the super-earth 55 Cnc e Open
The study of exoplanets and especially their atmospheres can reveal key insights on their evolution by identifying specific atmospheric species. For such atmospheric investigations, high-resolution transmission spectroscopy has shown great…
View article: On the parameter refinement of inflated exoplanets with large radius uncertainty based on TESS observations
On the parameter refinement of inflated exoplanets with large radius uncertainty based on TESS observations Open
We revisited 10 known exoplanetary systems using publicly available data provided by the transiting exoplanet survey satellite (TESS). The sample presented in this work consists of short period transiting exoplanets, with inflated radii an…
View article: Role of the impact parameter in exoplanet transmission spectroscopy
Role of the impact parameter in exoplanet transmission spectroscopy Open
Transmission spectroscopy is the widely used observational technique that exploits the planetary transit events with aim to characterize the exoplanetary atmospheres. While it already revealed atomic and molecular absorption, haze layers a…
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: 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: 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: 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: Deciphering the atmosphere of HAT-P-12b: solving discrepant results
Deciphering the atmosphere of HAT-P-12b: solving discrepant results Open
Context. Two independent investigations of the atmosphere of the hot Jupiter HAT-P-12b by two different groups resulted in discrepant solutions. Using broad-band photometry from the ground, one study found a flat and featureless transmissi…