Simulated mass measurements of the young planet K2-33b

Klein, Baptiste; Donati, J.‐F.

doi:10.1093/mnrasl/slaa009

Cited by 14 publications

(11 citation statements)

References 31 publications

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“…Given the low number of RV points, we chose to fix 2 of the 4 hyperparameters, namely the decay timescale 𝜃 2 (exponential timescale on which modeled RVs depart from pure periodicity) and the smoothing parameter 𝜃 4 (controling the amount of short-term variations in 4. We ran our 5 As shown in Klein & Donati (2020), surface features induce more complex modulation on RVs than on light curves, hence the smaller value of the smoothing parameter 𝜃 4 used here compared to that derived when fitting the TESS data (see Sec. 2.2).…”

Section: Radial Velocitiesmentioning

confidence: 99%

The T Tauri star V410 Tau in the eyes of SPIRou and TESS

Finociety

Donati

Klein

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We report results of a spectropolarimetric and photometric monitoring of the weak-line T Tauri star V410 Tau based on data collected mostly with SPIRou, the near-infrared (NIR) spectropolarimeter recently installed at the Canada-France-Hawaii Telescope, as part of the SPIRou Legacy Survey large programme, and with TESS between October and December 2019. Using Zeeman-Doppler Imaging (ZDI), we obtained the first maps of photospheric brightness and large-scale magnetic field at the surface of this young star derived from NIR spectropolarimetric data. For the first time, ZDI is also simultaneously applied to high-resolution spectropolarimetric data and very-high-precision photometry. V410 Tau hosts both dark and bright surface features and magnetic regions similar to those previously imaged with ZDI from optical data, except for the absence of a prominent dark polar spot. The brightness distribution is significantly less contrasted than its optical equivalent, as expected from the difference in wavelength. The large-scale magnetic field (${\sim }410$ G), found to be mainly poloidal, features a dipole of ${\sim }390$ G, again compatible with previous studies at optical wavelengths. NIR data yield a surface differential rotation slightly weaker than that estimated in the optical at previous epochs. Finally, we measured the radial velocity of the star and filtered out the stellar activity jitter using both ZDI and Gaussian Process Regression down to a precision of ${\sim }0.15$ and 0.08 km s−1 RMS, respectively, confirming the previously published upper limit on the mass of a potential close-in massive planet around V410 Tau.

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Section: Radial Velocitiesmentioning

confidence: 99%

The T Tauri star V410 Tau in the eyes of SPIRou and TESS

Finociety

Donati

Klein

et al. 2021

Monthly Notices of the Royal Astronomical Society

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“…To test that our RV precision and the RV sampling are sufficient to accurately constrain the Keplerian parameters of K2-25b, we performed two series of injection and recovery tests, broadly following the methodology in Klein & Donati (2020). For both series of tests, we injected a signal with known Keplerian parameters (P, T C , K, ω, e) and GP hyperparameters (P GP , σ GP , α GP , Γ GP ), along with a whitenoise parameter (σ w ).…”

Section: Rv Injection and Recovery Testsmentioning

confidence: 99%

The Habitable Zone Planet Finder Reveals a High Mass and Low Obliquity for the Young Neptune K2-25b

Stefánsson

Mahadevan

Maney

et al. 2020

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Using radial velocity data from the Habitable Zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5 dwarf host star in the 600-800 Myr Hyades cluster. This is one of the youngest planetary systems for which both of these quantities have been measured and one of the very few M dwarfs with a measured obliquity. Based on a joint analysis of the radial velocity data, time-series photometry from the K2 mission, and new transit light curves obtained with diffuser-assisted photometry, the planet's radius and mass are 3.44±0.12 R ⊕ and -+ Å M 24.5 5.2 5.7. These properties are compatible with a rocky core enshrouded by a thin hydrogen-helium atmosphere (5% by mass). We measure an orbital eccentricity of e=0.43±0.05. The skyprojected stellar obliquity is λ=3°±16°, compatible with spin-orbit alignment, in contrast to other "hot Neptunes" that have been studied around older stars.

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“…The bulk of the SLS-TF targets to be monitored is provided by TESS (Ricker et al 2016). Knowing in advance both orbital periods and transit times from photometry partly compensates for SLS-TF targets being in average 2 magnitudes fainter than SLS-PS ones and ensures that the velocimetric signal can be detected with only a few tens of visits for simple systems, even when activity dominates the RV signal (Klein & Donati 2020, Klein et al 2020a. Among the 500 planets orbiting M dwarfs that TESS expects to unveil, we will monitor about 20 of the most interesting ones around the brightest stars visible from CFHT, in particular those located in the HZ of their host stars ( 10 for mid M dwarfs with K<10, Barclay et al 2018).…”

Section: Planetary Systems Of M Dwarfsmentioning

confidence: 99%

SPIRou: nIR velocimetry & spectropolarimetry at the CFHT

Donati,

Kouach,

Moutou

et al. 2020

Preprint

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This paper presents an overview of SPIRou, the new-generation near-infrared spectropolarimeter / precision velocimeter recently installed on the 3.6-m Canada-France-Hawaii Telescope (CFHT). Starting from the two main science goals, namely the quest for planetary systems around nearby M dwarfs and the study of magnetized star / planet formation, we outline the instrument concept that was designed to efficiently address these forefront topics, and detail the in-lab and on-sky instrument performances measured throughout the intensive testing phase that SPIRou was submitted to before passing the final acceptance review in early 2019 and initiating science observations. With a central position among the newly started programmes, the SPIRou Legacy Survey (SLS) Large Programme was allocated 300 CFHT nights until at least mid 2022.We also briefly describe a few of the first results obtained in the various science topics that SPIRou started investigating, focusing in particular on planetary systems of nearby M dwarfs, transiting exoplanets and their atmospheres, magnetic fields of young stars, but also on alternate science goals like the atmospheres of M dwarfs and the Earth's atmosphere. We finally conclude on the essential role that SPIRou and the CFHT can play in coordination with forthcoming major facilities like the JWST, the ELTs, PLATO and ARIEL over the decade.

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Simulated mass measurements of the young planet K2-33b

Cited by 14 publications

References 31 publications

The T Tauri star V410 Tau in the eyes of SPIRou and TESS

The T Tauri star V410 Tau in the eyes of SPIRou and TESS

The Habitable Zone Planet Finder Reveals a High Mass and Low Obliquity for the Young Neptune K2-25b

SPIRou: nIR velocimetry & spectropolarimetry at the CFHT

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