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: -------------------------------------------------- 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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file mjump.dat 148 371 Observational HARPS-N data -------------------------------------------------------------------------------- Byte-by-byte Description of file: mjump.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Acknowledgements: Matteo Pinamonti, matteo.pinamonti(at)inaf.it References: Covino et al., Paper I 2013A&A...554A..28C 2013A&A...554A..28C, Cat. J/A+A/554/A28 Desidera et al., Paper II 2013A&A...554A..29D 2013A&A...554A..29D Esposito et al., Paper III 2014A&A...564L..13E 2014A&A...564L..13E Desidera et al., Paper IV 2014A&A...567L...6D 2014A&A...567L...6D Damasso et al., Paper V 2015A&A...575A.111D 2015A&A...575A.111D, Cat. J/A+A/575/A111 Sozzetti et al., Paper VI 2015A&A...575L..15S 2015A&A...575L..15S, Cat. J/A+A/575/L15 Borsa et al., Paper VII 2015A&A...578A..64B 2015A&A...578A..64B, Cat. J/A+A/578/A64 Mancini et al., Paper VIII 2015A&A...579A.136M 2015A&A...579A.136M, Cat. J/A+A/579/A136 Damasso et al., Paper IX 2015A&A...581L...6D 2015A&A...581L...6D Biazzo et al., Paper X 2015A&A...583A.135B 2015A&A...583A.135B, Cat. J/A+A/583/A135 Malavolta et al., Paper XI 2016A&A...588A.118M 2016A&A...588A.118M, Cat. J/A+A/588/A118 Benatti et al., Paper XII 2017A&A...599A..90B 2017A&A...599A..90B, Cat. 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J/A+A/664/A163 Guilluy et al., Paper XXXVIII 2022A&A...665A.104G 2022A&A...665A.104G Carleo et al., Paper XXXIX 2022AJ....164..101C 2022AJ....164..101C Naponiello et al., Paper XL 2022A&A...667A...8N 2022A&A...667A...8N Pino et al., Paper XLI 2022A&A...668A.176P 2022A&A...668A.176P Damasso et al., Paper XLII 2023A&A...672A.126D 2023A&A...672A.126D Maldonado et al., Paper XLIII 2023A&A...674A.132M 2023A&A...674A.132M Rainer et al., Paper XLIV 2023A&A...676A..90R 2023A&A...676A..90R, Cat. J/A+A/676/A90 Fossati et al., Paper XLV 2023A&A...676A..99F 2023A&A...676A..99F
(End) Matteo Pinamonti [INAF-OATO, Italy], Patricia Vannier [CDS] 07-Jul-2023
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