WASP-47: A HOT JUPITER SYSTEM WITH TWO ADDITIONAL PLANETS DISCOVERED BY K2

By J. Becker, Andrew Vanderburg, Fred C. Adams, S. Rappaport, H. Schwengeler. 2015

168 citations recorded by the source corpus.

Using new data from the K2 mission, we show that WASP-47, a previously known hot Jupiter host, also hosts two additional transiting planets: a Neptune-sized outer planet and a super-Earth inner companion. We measure planetary properties from the K2 light curve and detect transit timing variations (TTVs), confirming the planetary nature of the outer planet. We performed a large number of numerical simulations to study the dynamical stability of the system and to find the theoretically expected TTVs. The theoretically predicted TTVs are in good agreement with those observed, and we use the TTVs to determine the masses of two planets, and place a limit on the third. The WASP-47 planetary system is important because companion planets can both be inferred by TTVs and are also detected directly through transit observations. The depth of the hot Jupiter's transits make ground-based TTV measurements possible, and the brightness of the host star makes it amenable for precise radial velocity measurements. The system serves as a Rosetta Stone for understanding TTVs as a planet detection technique.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/fbc995f72ef22a15eb3a778cd506443c91c34108

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. D. Charbonneau
2. E. Gaidos
3. A. Mann
4. A. Kraus
5. J. Johnson
6. Michael J. Ireland
7. Andrew Vanderburg
8. E. Newton

Citations in the corpus

• The GAPS Programme with HARPS-N at TNG - XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets (2017, unknown): “Two examples of hot giant planets in compact systems are the planetary systems Kepler-101 (Bonomo et al. 2014) and WASP-47 (Becker et al. 2015).”
• PLANETARY CANDIDATES FROM THE FIRST YEAR OF THE K2 MISSION (2015, methodology): “…202126849, Bakos et al. 2015), HAT-P-56 (EPIC 202126852, Huang et al. 2015b), WASP-85 (EPIC 201862715, Brown et al. 2014), WASP-47 (and its two additional transiting planets; EPIC 206103150, Hellier et al. 2012; Becker et al. 2015), and WASP-75 (EPIC 206154641, Gómez Maqueo Chew et al. 2013).”
• FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 428 LIKELY FALSE POSITIVES (2016, unknown): “E P] 1 0 M ay 2 01 6 applied to a number of candidates found by the K2 mission (Montet et al. 2015; Becker et al. 2015).”
• IN SITU FORMATION AND DYNAMICAL EVOLUTION OF HOT JUPITER SYSTEMS (2015, methodology): “Follow-up observations using the Kepler space telescope in its K2 operation mode have led to the discovery of two additional transiting Super-Earth planets in the system (Becker et al. 2015); an inner, ultra-short period planet, “c”, with MP < 9M⊕ and P = 0.”
• Identifying Exoplanets with Deep Learning: A Five-planet Resonant Chain around Kepler-80 and an Eighth Planet around Kepler-90 (2017, background): “…planets (Morton et al. 2016) and two candidates, including a warm Jupiter, an ultra-short-period planet (Sanchis-Ojeda et al. 2014), and a superEarth in between, giving it a distinct architecture reminiscent of the 55 Cnc (Nelson et al. 2014) and WASP-47 (Becker et al. 2015) planetary systems.”
• ZODIACAL EXOPLANETS IN TIME (ZEIT). III. A SHORT-PERIOD PLANET ORBITING A PRE-MAIN-SEQUENCE STAR IN THE UPPER SCORPIUS OB ASSOCIATION (2016, methodology): “Following Becker et al. (2015) and Mann et al. (2016) we extracted a new light curve by simultaneously fitting for low frequency variations from stellar activity, Kepler flat field, and the transits of K2-33b using a least-square minimization.”