HADES RV Programme with HARPS-N at TNG Article Swipe
A. K. Stefanov
,
A. Suárez Mascareño
,
J. I. Gónzalez Hernández
,
N. Nari
,
R. Rébolo
,
L. Affer
,
G. Micela
,
I. Ribas
,
A. Sozzetti
,
M. Perger
,
M. Pinamonti
,
M. Damasso
,
J. Maldonado
,
E. González-Álvarez
,
G. Scandriato
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202452630
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202452630
The low masses of M dwarfs create attractive opportunities for exoplanet radial-velocity (RV) detections. These stars, however, exhibit strong stellar activity that may attenuate or mimic planetary signals. We present a velocimetric analysis of one such M dwarf, GJ 3998 ( d = 18.2 pc), with two published short-period super-Earths: GJ 3998 b and GJ 3998 c. We use additional data from the HARPS-N spectrograph to confirm these two planets and to look for more. We carry out joint modelling of: (i) RV planetary signals, (ii) stellar rotation in RV and activity indicators through Gaussian processes, and (iii) long-term trends in RV and activity indicators. We constrain the rotational period of GJ 3998 to P rot = 30.2 ± 0.3 d and discover long-term sinusoidal imprints in RV and the full width at half maximum with a period of P cyc = 316 −8 +14 d. We confirm GJ 3998 b and GJ 3998 c, and detect a third planet: GJ 3998 d, whose signal had previously been attributed to stellar activity. GJ 3998 d has an orbital period of 41.78 ± 0.05 d, a minimum mass of 6.07 −0.96 +1.00 M ⊕ , and a mean insolation flux of 1.2 −0.2 +0.3 Φ ⊕ . This makes it one of the few known planets receiving an Earth-like insolation flux.
Related Topics
Concepts
Physics
Planet
Astrobiology
Circumstellar habitable zone
Earth (classical element)
Astronomy
Super-Earth
Planetary system
Astrophysics
Exoplanet
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1051/0004-6361/202452630
- OA Status
- hybrid
- Cited By
- 1
- References
- 93
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4407173195
All OpenAlex metadata
Raw OpenAlex JSON
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https://openalex.org/W4407173195Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1051/0004-6361/202452630Digital Object Identifier
- Title
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HADES RV Programme with HARPS-N at TNGWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-02-05Full publication date if available
- Authors
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A. K. Stefanov, A. Suárez Mascareño, J. I. Gónzalez Hernández, N. Nari, R. Rébolo, L. Affer, G. Micela, I. Ribas, A. Sozzetti, M. Perger, M. Pinamonti, M. Damasso, J. Maldonado, E. González-Álvarez, G. ScandriatoList of authors in order
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https://doi.org/10.1051/0004-6361/202452630Publisher landing page
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://doi.org/10.1051/0004-6361/202452630Direct OA link when available
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Physics, Planet, Astrobiology, Circumstellar habitable zone, Earth (classical element), Astronomy, Super-Earth, Planetary system, Astrophysics, ExoplanetTop concepts (fields/topics) attached by OpenAlex
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1Total citation count in OpenAlex
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2025: 1Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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