Activity and telluric contamination in HARPS observations of Alpha Centauri B

Maksym Lisogorskyi; Hugh Jones; Fabo Feng

doi:10.1093/mnras/stz694

Activity and telluric contamination in HARPS observations of Alpha Centauri B

Maksym Lisogorskyi, Hugh Jones, Fabo Feng

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Abstract

The Alpha Centauri system is the primary target for planet search as it is the closest star system composed of a solar twin α CenA, a K-dwarf α Cen B, and an M-dwarf Proxima Centauri, which has a confirmed planet in the temperate zone. α CenA and B weremonitored intensively with the HARPS spectrograph for over 10 yr, providing high-precision radial velocity (RV) measurements. In this work, we study the available data to better understand the stellar activity and other contaminating signals.We highlight the importance of telluric contamination and its impact on the RV measurements. Our suggested procedures lead to discarding about 5 per cent of HARPS data, providing a data set with an rms improved by a factor of 2. We compile and quantify the behaviour of 345 spectral lines with a wide range of line shapes and sensitivity to activity.

Original language	English
Pages (from-to)	4804–4816
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	485
Issue number	4
Early online date	27 Mar 2019
DOIs	https://doi.org/10.1093/mnras/stz694
Publication status	Published - 1 Jun 2019

Keywords

Planets and satellites: Detection
stars: Activity
stars: Individual: HD128621
techniques: Radial velocities

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10.1093/mnras/stz694

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title = "Activity and telluric contamination in HARPS observations of Alpha Centauri B",

abstract = "The Alpha Centauri system is the primary target for planet search as it is the closest star system composed of a solar twin α CenA, a K-dwarf α Cen B, and an M-dwarf Proxima Centauri, which has a confirmed planet in the temperate zone. α CenA and B weremonitored intensively with the HARPS spectrograph for over 10 yr, providing high-precision radial velocity (RV) measurements. In this work, we study the available data to better understand the stellar activity and other contaminating signals.We highlight the importance of telluric contamination and its impact on the RV measurements. Our suggested procedures lead to discarding about 5 per cent of HARPS data, providing a data set with an rms improved by a factor of 2. We compile and quantify the behaviour of 345 spectral lines with a wide range of line shapes and sensitivity to activity.",

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AU - Lisogorskyi, Maksym

AU - Jones, Hugh

AU - Feng, Fabo

PY - 2019/6/1

Y1 - 2019/6/1

N2 - The Alpha Centauri system is the primary target for planet search as it is the closest star system composed of a solar twin α CenA, a K-dwarf α Cen B, and an M-dwarf Proxima Centauri, which has a confirmed planet in the temperate zone. α CenA and B weremonitored intensively with the HARPS spectrograph for over 10 yr, providing high-precision radial velocity (RV) measurements. In this work, we study the available data to better understand the stellar activity and other contaminating signals.We highlight the importance of telluric contamination and its impact on the RV measurements. Our suggested procedures lead to discarding about 5 per cent of HARPS data, providing a data set with an rms improved by a factor of 2. We compile and quantify the behaviour of 345 spectral lines with a wide range of line shapes and sensitivity to activity.

AB - The Alpha Centauri system is the primary target for planet search as it is the closest star system composed of a solar twin α CenA, a K-dwarf α Cen B, and an M-dwarf Proxima Centauri, which has a confirmed planet in the temperate zone. α CenA and B weremonitored intensively with the HARPS spectrograph for over 10 yr, providing high-precision radial velocity (RV) measurements. In this work, we study the available data to better understand the stellar activity and other contaminating signals.We highlight the importance of telluric contamination and its impact on the RV measurements. Our suggested procedures lead to discarding about 5 per cent of HARPS data, providing a data set with an rms improved by a factor of 2. We compile and quantify the behaviour of 345 spectral lines with a wide range of line shapes and sensitivity to activity.

KW - Planets and satellites: Detection

KW - stars: Activity

KW - stars: Individual: HD128621

KW - techniques: Radial velocities

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DO - 10.1093/mnras/stz694

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

Activity and telluric contamination in HARPS observations of Alpha Centauri B

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Keywords

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