J/A+A/677/A122 GJ 328, 649 and 849 HARPS-N observations (Pinamonti+, 2023)
The GAPS programme at TNG. XLVI.
Deep search for low-mass planets in late-dwarf systems hosting cold Jupiters.
Pinamonti M., Barbato D., Sozzetti A., Affer L., Benatti S., Biazzo K.,
Bignamini A., Borsa F., Damasso M., Desidera S., Lanza A.F., Maldonado J.,
Mancini L., Naponiello L., Nardiello D., Rainer M., Cabona L., Knapic C.,
Andreuzzi G., Cosentino R., Fiorenzano A., Ghedina A., Harutyunyan A.,
Lorenzi V., Pedani M., Claudi R., Covino E., Maggio A., Micela G.,
Molinari E., Pagano I., Piotto G., Poretti E.
<Astron. Astrophys. 677, A122 (2023)>
=2023A&A...677A.122P 2023A&A...677A.122P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, late-type ; Stars, M-type ;
Spectroscopy ; Exoplanets ; Radial velocities ; Optical
Keywords: techniques: radial velocities - stars: individual: GJ 328 -
stars: individual: GJ 649 - stars: activity -
planets and satellites: detection
Abstract:
With the growth of comparative exoplanetology, it is increasingly
clear that the relationship between inner and outer planets plays a
key role in unveiling the mechanisms governing formation and evolution
models. For this reason, it is important to probe the inner region of
systems hosting long-period giants in search of undetected lower mass
planetary companions.
We aim to present the results of a high-cadence and high-precision
radial velocity (RV) monitoring of three late-type dwarf stars hosting
long-period giants with well-measured orbits in order to search for
short-period sub-Neptunes (SN, Msini<30M⊕).
Building on the results and expertise of our previous studies, we
carried out combined fits of our HARPS-N data with literature RVs. We
used Markov chain Monte Carlo (MCMC) analyses to refine the literature
orbital solutions and search for additional inner planets, applying
Gaussian process regression techniques to deal with the stellar
activity signals where required. We then used the results of our
survey to estimate the frequency of sub-Neptunes in systems hosting
cold Jupiters, f(SN|CJ), and compared it with the frequency around
field M dwarfs, f(SN).
We identify a new short-period, low-mass planet orbiting GJ 328, GJ
328 c, with Pc=241.8+1.3-1.7d and
Mcsini=21.4+3.4-3.2M⊕. We moreover identify and model
the chromospheric activity signals and rotation periods of GJ 649 and
GJ 849, around which no additional planet is found. Then, taking into
account also planetary system around the previously analysed low-mass
star BD-11 4672, we derive an estimate of the frequencies of inner
planets in such systems. In particular, f(SN|CJ)=0.25+0.58-0.07
for mini-Neptunes (10M⊕<Msini<30M⊕, P<150d),
marginally larger than f(SN). For lower mass planets
(Msini<10M⊕) instead f(SN|CJ)<0.69, which is compatible with
f(SN).
In light of the newly detected mini-Neptune, we find tentative
evidence of a positive correlation between the presence of long-period
giant planets and that of inner low-mass planets, f(SN|CJ)>f(SN).
This might indicate that cold Jupiters have an opposite influence in
the formation of inner sub-Neptunes around late-type dwarfs as opposed
to their solar-type counterparts, boosting the formation of
mini-Neptunes instead of impeding it.
Description:
File mjump.dat provides the observational data collected with the
HARPS-N spectrograph for three studied targets, and used in the
present study.
Objects:
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RA (2000) DE Designation(s)
--------------------------------------------------
08 55 07.62 +01 32 47.4 GJ 328 = TIC 265373654
16 58 08.84 +25 44 38.9 GJ 649 = TIC 236743275
22 09 40.34 -04 38 26.6 GJ 849 = TIC 248027247
--------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
mjump.dat 148 371 Observational HARPS-N data
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Byte-by-byte Description of file: mjump.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Target Target Identifier
17- 28 F12.6 d BJD Observation date (BJD-2400000)
30- 40 F11.6 m/s RV Radial Velocity
42- 52 F11.6 m/s e_RV Uncertainty on radial velocity
54- 64 F11.6 --- CaII Activity CaII index
66- 76 F11.6 --- e_CaII Uncertainty on CaII index
78- 88 F11.6 --- Halpha Activity Halpha index
90-100 F11.6 --- e_Halpha Uncertainty on Halpha index
102-112 F11.6 --- NaI Activity NaI index
114-124 F11.6 --- e_NaI Uncertainty on NaI index
126-136 F11.6 --- HeI Activity HeI index
138-148 F11.6 --- e_HeI Uncertainty on HeI index
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Acknowledgements:
Matteo Pinamonti, matteo.pinamonti(at)inaf.it
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(End) Matteo Pinamonti [INAF-OATO, Italy], Patricia Vannier [CDS] 07-Jul-2023