Trio of super-Earth candidates orbiting K-dwarf HD 48948: a new habitable zone candidate

Author:

Dalal S1,Rescigno F1ORCID,Cretignier M2ORCID,Anna John A3ORCID,Majidi F Z456ORCID,Malavolta L45ORCID,Mortier A7ORCID,Pinamonti M5ORCID,Buchhave L A8ORCID,Haywood R D1,Sozzetti A5ORCID,Dumusque X9,Lienhard F10,Rice K1112,Vanderburg A13,Lakeland B1,Bonomo A S5,Cameron A Collier414,Damasso M5,Affer L15,Boschin W161718,Cooke B1920,Cosentino R18,Fabrizio L Di16,Ghedina A16,Harutyunyan A16,Latham D W21,López-Morales M21,Lovis C9,Fiorenzano A F Martínez16,Mayor M9,Nicholson B22,Pepe F9,Stalport M2324,Udry S9,Watson C A25,Wilson T G414

Affiliation:

1. Department of Astrophysics, University of Exeter , Stocker Rd, Exeter EX4 4QL , UK

2. Department of Physics, University of Oxford , OX13RH Oxford , UK

3. SUPA, School of Physics & Astronomy, University of St Andrews , North Haugh, St Andrews KY169SS , UK

4. Dipartimento di Fisica e Astronomia ‘Galileo Galilei’ – Università degli Studi di Padova , Vicolo dell’Osservatorio 3, I-35122 Padova , Italy

5. INAF - Osservatorio Astrofisico di Torino , via Osservatorio 20, I-10025 Pino Torinese , Italy

6. Blue Skies Space , Italia SRL, via Vincenzo Monti 16, 20123, Milano , Italy

7. Department of Astrophysics, University of Birmingham , Edgbaston, Birmingham B15 2TT , UK

8. DTU Space, Technical University of Denmark , Elektrovej 328, DK-2800 Kgs. Lyngby , Denmark

9. Observatoire de Genève, Université de Genève , Chemin Pegasi, 51, CH-1290 Versoix , Switzerland

10. Astrophysics Group, Cavendish Laboratory, University of Cambridge , J.J. Thomson Avenue, Cambridge CB3 0HE , UK

11. SUPA, Institute for Astronomy, The Royal Observatory, University of Edinburgh , Blackford Hill, Edinburgh EH9 3HJ , UK

12. Centre for Exoplanet Science, University of Edinburgh , Edinburgh EH9 3FD , UK

13. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139 , USA

14. Centre for Exoplanet Science, University of St Andrews , North Haugh, St Andrews KY169SS , UK

15. INAF – Osservatorio Astronomico di Palermo , Piazza del Parlamento, 1, I-90134, Palermo , Italy

16. Fundación Galileo Galilei – INAF (Telescopio Nazionale Galileo) , Rambla J. A. F. Perez 7, E-38712 Breña Baja (La Palma), Canary Islands , Spain

17. Instituto de Astrofísica de Canarias , C/Vía Láctea s/n, E-38205 La Laguna (Tenerife), Canary Islands , Spain

18. Departamento de Astrofísica, Universidad de La Laguna , Av. del Astrofísico Francisco Sánchez s/n, E-38205 La Laguna (Tenerife), Canary Islands , Spain

19. Centre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK

20. Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK

21. Center for Astrophysics, Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138 , USA

22. Centre for Astrophysics, University Of Southern Queensland , West Str, Toowoomba, QLD 4350 , Australia

23. Space sciences, Technologies and Astrophysics Research (STAR) Institute , Université de Liège, Allée du Six-Août 19C, B-4000 Liège , Belgium

24. Astrobiology Research Unit, Université de Liège , Allée du 6 Août 19C, B-4000 Liège , Belgium

25. Astrophysics Research Centre, Queen’s University Belfast , Belfast BT7 1NN , UK

Abstract

ABSTRACT We present the discovery of three super-Earth candidates orbiting HD 48948, a bright K-dwarf star with an apparent magnitude of $m_V$  = 8.58 mag. As part of the HARPS-N Rocky Planet Search programme, we collect 189 high-precision radial velocity measurements using the HARPS-N spectrograph from 2013 October 6, to 2023 April 16. Various methodologies are applied to extract the radial velocities from the spectra, and we conduct a comprehensive comparative analysis of the outcomes obtained through these diverse extraction techniques. To ensure the robustness of our findings, we employ several methods to address stellar variability, with a focus on Gaussian Process regression. To account for the impact of stellar variability and correlated noise in the radial velocity data set, we include activity indicators, such as $\log R^{^{\prime }}_{\mathrm{HK}}$ and bisector span, in the multidimensional Gaussian Process regression. Our analysis reveals three planetary candidates with orbital periods of 7.3, 38, and 151 d, and minimum masses estimated at $4.88 \pm 0.21$ M$_{\oplus }$, $7.27 \pm 0.70$ M$_{\oplus }$, and $10.59 \pm 1.00$ M$_{\oplus }$, respectively. The outermost planet resides within the (temperate) habitable zone, positioned at a projected distance of $0.029\,{\rm arcsec}$ from its star. Given the close proximity of this planetary system, situated at a distance of 16.8 parsecs, HD 48498 emerges as a promising target (closest super-Earth around FGK stars) for future high-contrast direct imaging and high-resolution spectroscopic studies.

Funder

STFC

Swiss National Science Foundation

European Space Agency

Publisher

Oxford University Press (OUP)

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. The mean longitudinal magnetic field and its uses in radial-velocity surveys;Monthly Notices of the Royal Astronomical Society;2024-07-05

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3