The impact of stellar surface magnetoconvection and oscillations on the detection of temperate, Earth-mass planets around Sun-like stars

HM Cegla - Geosciences, 2019 - mdpi.com
Detecting and confirming terrestrial planets is incredibly difficult due to their tiny size and
mass relative to Sun-like host stars. However, recent instrumental advancements are making …

Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO

S Sulis, M Lendl, HM Cegla, LFR Díaz, L Bigot… - Astronomy & …, 2023 - aanda.org
Context. Stellar granulation generates fluctuations in photometric and spectroscopic data
whose properties depend on the stellar type, composition, and evolutionary state …

Unexpectedly strong effect of supergranulation on the detectability of Earth twins orbiting Sun-like stars with radial velocities

N Meunier, AM Lagrange - Astronomy & Astrophysics, 2019 - aanda.org
Context. Magnetic activity and surface flows at different scales pertub radial velocity
measurements. This affects the detectability of low-mass exoplanets. Aims. In these flows …

Semi-supervised multiple testing

D Mary, E Roquain - Electronic Journal of Statistics, 2022 - projecteuclid.org
An important limitation of standard multiple testing procedures is that the null distribution
should be known. Here, we consider a null distribution-free approach for multiple testing in …

The effects of granulation and supergranulation on Earth-mass planet detectability in the habitable zone around F6-K4 stars

N Meunier, AM Lagrange - Astronomy & Astrophysics, 2020 - aanda.org
Context. The detectability of exoplanets and the determination of their projected mass in
radial velocity are affected by stellar magnetic activity and photospheric dynamics. Among …

Revisiting BD-06 1339b: A Likely False Positive Caused by Stellar Activity

ER Simpson, T Fetherolf, SR Kane, Z Li… - The Astronomical …, 2022 - iopscience.iop.org
As long as astronomers have searched for exoplanets, the intrinsic variability of host stars
has interfered with the ability to reliably detect and confirm exoplanets. One particular source …

A Study of Two Periodogram Algorithms for Improving the Detection of Small Transiting Planets

Y Gondhalekar, ED Feigelson… - The Astrophysical …, 2023 - iopscience.iop.org
The sensitivities of two periodograms are compared for weak signal planet detection in
transit surveys: the widely used Box Least Squares (BLS) algorithm following light curve …

Applying xgboost machine learning model to succor astronomers detect exoplanets in distant galaxies

N Agarwal, A Jain, A Gupta, DK Tayal - International Conference on …, 2021 - Springer
The time when TRAPPIST-1 news became official on 22.02. 2017, detection of planets
beyond Milky Way Galaxy or planets orbiting around their own sun-like stars became one of …

False discovery rate control with unknown null distribution: Is it possible to mimic the oracle?

E Roquain, N Verzelen - The Annals of Statistics, 2022 - projecteuclid.org
Classical multiple testing theory prescribes the null distribution, which is often too stringent
an assumption for nowadays large scale experiments. This paper presents theoretical …

3D magneto-hydrodynamical simulations of stellar convective noise for improved exoplanet detection-I. Case of regularly sampled radial velocity observations

S Sulis, D Mary, L Bigot - Astronomy & Astrophysics, 2020 - aanda.org
Context. Convective motions at the stellar surface generate a stochastic colored noise
source in the radial velocity (RV) data. This noise impedes the detection of small exoplanets …