starry: Analytic Occultation Light Curves

Luger, Rodrigo; Agol, Eric; Foreman-Mackey, Daniel; Fleming, D. P.; Lustig‐Yaeger, Jacob; Deitrick, Russell

doi:10.3847/1538-3881/aae8e5

Cited by 298 publications

(283 citation statements)

References 49 publications

(53 reference statements)

Supporting

Mentioning

271

Contrasting

Unclassified

Order By: Relevance

“…We modeled the stellar variability and transits simultaneously using a combination of the exoplanet (Foreman-Mackey et al 2019), Starry (Luger et al 2019), and PyMC3 (Salvatier et al 2016) packages. The transit model within the exoplanet package is computed with Starry, and in our case was described by the following parameters: the mean out-of-transit flux ( f ), quadratic limb darkening coefficients (u 1 , u 2 ), stellar mass (M /M ) and radius (R /R ), log of the orbital period (ln P ), time of mid-transit (T 0 ), log of the planet radius (ln R P /R ), impact parameter (b), eccentricity (e), and longitude of periastron (ω).…”

Section: Transit Modelmentioning

confidence: 99%

Four Newborn Planets Transiting the Young Solar Analog V1298 Tau

David

Petigura

Luger

et al. 2019

ApJL

Self Cite

154

158

View full text Add to dashboard Cite

Exoplanets orbiting pre-main sequence stars are laboratories for studying planet evolution processes, including atmospheric loss, orbital migration, and radiative cooling. V1298 Tau, a young solar analog with an age of 23 ± 4 Myr, is one such laboratory. The star is already known to host a Jupiter-sized planet on a 24 day orbit. Here, we report the discovery of three additional planets -all between the size of Neptune and Saturn -based on our analysis of K2 Campaign 4 photometry. Planets c and d have sizes of 5.6 and 6.4 R ⊕ , respectively and with orbital periods of 8.25 and 12.40 days reside 0.25% outside of the nominal 3:2 mean-motion resonance. Planet e is 8.7 R ⊕ in size but only transited once in the K2 time series and thus has a period longer than 36 days, but likely shorter than 223 days. The V1298 Tau system may be a precursor to the compact multiplanet systems found to be common by the Kepler mission. However, the large planet sizes stand in sharp contrast to the vast majority of Kepler multis which have planets smaller than 3 R ⊕ . Simple dynamical arguments suggest total masses of <28 M ⊕ and <120 M ⊕ for the c-d and d-b planet pairs, respectively. The implied low masses suggest that the planets may still be radiatively cooling and contracting, and perhaps losing atmosphere. The V1298 Tau system offers rich prospects for further follow-up including atmospheric characterization by transmission or eclipse spectroscopy, dynamical characterization 2 David et al.through transit-timing variations, and measurements of planet masses and obliquities by radial velocities.

show abstract

Section: Transit Modelmentioning

confidence: 99%

Four Newborn Planets Transiting the Young Solar Analog V1298 Tau

David

Petigura

Luger

et al. 2019

ApJL

Self Cite

154

158

View full text Add to dashboard Cite

show abstract

“…starry (Luger et al 2019), and PyMC3 (Salvatier et al 2016) packages. We again used the everest 2.0 light curve for this fit.…”

Section: Simultaneous Variability and Transit Fitsmentioning

confidence: 99%

A Warm Jupiter-sized Planet Transiting the Pre-main-sequence Star V1298 Tau

David

Cody

Hedges

et al. 2019

View full text Add to dashboard Cite

We report the detection of V1298 Tau b, a warm Jupiter-sized planet (R P = 0.91 ± 0.05 R Jup , P = 24.1 days) transiting a young solar analog with an estimated age of 23 million years. The star and its planet belong to Group 29, a young association in the foreground of the Taurus-Auriga starforming region. While hot Jupiters have been previously reported around young stars, those planets are non-transiting and near-term atmospheric characterization is not feasible. The V1298 Tau system is a compelling target for follow-up study through transmission spectroscopy and Doppler tomography owing to the transit depth (0.5%), host star brightness (K s = 8.1 mag), and rapid stellar rotation (v sin i = 23 km s −1 ). Although the planet is Jupiter-sized, its mass is presently unknown due to highamplitude radial velocity jitter. Nevertheless, V1298 Tau b may help constrain formation scenarios for at least one class of close-in exoplanets, providing a window into the nascent evolution of planetary interiors and atmospheres.

show abstract

“…Notably, lightkurve enables users to extract photometry using custom aperture masks, and remove motion systematics using tunable implementations of the SFF and PLD techniques. • exoplanet 5 (Foreman-Mackey et al 2019): A set of tools for fitting exoplanet transits and Gaussian Processes to long term trends using pymc3 6 based on the starry 7 and celerite 8 packages (Salvatier et al 2016;Luger et al 2019;Foreman-Mackey et al 2017).…”

Section: Background: Community Tools In Kepler K2 and Tessmentioning

confidence: 99%

Four Small Planets Buried in K2 Systems: What Can We Learn for TESS?

Hedges

Saunders

Barentsen

et al. 2019

ApJL

View full text Add to dashboard Cite

The Kepler , K2 , and TESS missions have provided a wealth of confirmed exoplanets, benefiting from a huge effort from the planet hunting and follow-up community. With careful systematics mitigation, these missions provide precise photometric time series, which enable detection of transiting exoplanet signals. However, exoplanet hunting can be confounded by several factors, including instrumental noise, search biases, and host star variability. In this letter, we discuss strategies to overcome these challenges using newly-emerging techniques and tools. We demonstrate the power of new, fast open source community tools (e.g., lightkurve, starry, celerite, exoplanet), and discuss four high signal-to-noise exoplanets that showcase specific challenges present in planet detection: K2-43c, K2-168c, K2-198c, and K2-198d. These planets have been undetected in several large K2 planet searches, despite having transit signals with SNR≥ 10. Two of the planets discussed here are new discoveries. In this work we confirm all four as true planets. Alongside these planet systems, we discuss three key challenges in finding small transiting exoplanets. The aim of this paper is to help new researchers understand where planet detection efficiency gains can be made, and to encourage the continued use of K2 archive data. The considerations presented in this letter are equally applicable to Kepler , K2 , and TESS , and the tools discussed here are available for the community to apply to improve exoplanet discovery and fitting.

show abstract

starry: Analytic Occultation Light Curves

Cited by 298 publications

References 49 publications

Four Newborn Planets Transiting the Young Solar Analog V1298 Tau

Four Newborn Planets Transiting the Young Solar Analog V1298 Tau

A Warm Jupiter-sized Planet Transiting the Pre-main-sequence Star V1298 Tau

Four Small Planets Buried in K2 Systems: What Can We Learn for TESS?

Contact Info

Product

Resources

About