Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Leveraging space-based data from the nearest Solar-type star to better
  understand stellar activity signatures in radial velocity data   Stellar variability is a key obstacle in reaching the sensitivity required to
recover Earth-like exoplanetary signals using the radial velocity (RV)
detection method. To explore activity signatures in Sun-like stars, we present
SolAster, a publicly-distributed analysis pipeline that allows for comparison
of space-based measurements with ground-based disk-integrated RVs. Using high
spatial resolution Dopplergrams, magnetograms, and continuum filtergrams from
the Helioseismic and Magnetic Imager (HMI) aboard the Solar Dynamics
Observatory (SDO), we estimate 'Sun-as-a-star' disk-integrated RVs due to
rotationally modulated flux imbalances and convective blueshift suppression, as
well as other observables such as unsigned magnetic flux. Comparing these
measurements with ground-based RVs from the NEID instrument, which observes the
Sun daily using an automated solar telescope, we find a strong relationship
between magnetic activity indicators and RV variation, supporting efforts to
examine unsigned magnetic flux as a proxy for stellar activity in slowly
rotating stars. Detrending against measured unsigned magnetic flux allows us to
improve the NEID RV measurements by ~20\% (~50 cm/s in a quadrature sum),
yielding an RMS scatter of ~60 cm/s over five months. We also explore
correlations between individual and averaged spectral line shapes in the NEID
spectra and SDO-derived magnetic activity indicators, motivating future studies
of these observables. Finally, applying SolAster to archival planetary transits
of Venus and Mercury, we demonstrate the ability to recover small amplitude (<
50 cm/s) RV variations in the SDO data by directly measuring the
Rossiter-McLaughlin (RM) signals.

2
The categories of this paper are: math
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph