J/ApJ/973/L30 TI-DYE. II. HIP 67522 light curves & transit data (Barber+, 2024)
TESS Investigation-Demographics of Young Exoplanets (TI-DYE).
II. A second giant planet in the 17Myr system HIP 67522.
Barber M.G., Thao Pa C., Mann A.W., Vanderburg A., Mori M.,
Livingston J.H., Fukui A., Narita N., Kraus A.L., Tofflemire B.M.,
Newton E.R., Winn J.N., Jenkins J.M., Seager S., Collins K.A.,
Twicken J.D.
<Astrophys. J., 973, L30 (2024)>
=2024ApJ...973L..30B 2024ApJ...973L..30B
ADC_Keywords: Exoplanets; Photometry, infrared; Optical; YSOs
Keywords: Exoplanets ; Transit photometry ; Stellar activity ;
Exoplanet evolution ; Young stellar objects
Abstract:
The youngest (<50Myr) planets are vital to understand planet formation
and early evolution. The 17 Myr system HIP 67522 is already known to
host a giant (∼10R⊕) planet on a tight orbit. In their
discovery paper, Rizzuto et al. reported a tentative single-transit
detection of an additional planet in the system using TESS. Here, we
report the discovery of HIP 67522c, a 7.9R⊕ planet that
matches with that single-transit event. We confirm the signal with
ground-based multiwavelength photometry from Sinistro and MuSCAT4. At
a period of 14.33days, planet c is close to a 2:1 mean-motion
resonance with b (6.96days or 2.06:1). The light curve shows
distortions during many of the transits, which are consistent with
spot-crossing events and/or flares. Fewer stellar activity events are
seen in the transits of planet b, suggesting that planet c is crossing
a more active latitude. Such distortions, combined with systematics in
the TESS light-curve extraction, likely explain why planet c was
previously missed.
Description:
HIP 67522 was first observed by TESS in Sector 11, from 2019 April 23
to 2019 May 20, and was reobserved in Sector 38 (2021 April 29-2021
May 26) and Sector 64 (2023 April 6-2023 May 3). The target was
preselected for 2min short-cadence light curves for Sector 11 and
Sector 38 and 20s light curves for Sector 64. In total, TESS observed
five transits of HIP 67522c.
On 2024 April 22, we observed a predicted transit of HIP 67522c using
the Multicolor Simultaneous Camera for studying Atmospheres of
Transiting exoplanets (MuSCAT4) on the 2m Faulkes Telescope South of
Las Cumbres Observatory (LCO) at the Siding Spring Observatory in
Australia. With MuSCAT4, we simultaneously imaged HIP 67522 in the g',
r', i', and zs bands with exposure times of 12, 7, 8, and 5s, respectively.
We observed a predicted transit of HIP 67522c on 2024 May 6 simultaneously
using three LCO 1m telescopes with the Sinistro cameras. For all
observations we used the filter and an exposure time of 10s.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------
13 50 06.27 -40 50 08.8 HIP 67522 = TOI-6551
13 50 06.27 -40 50 08.8 HIP 67522c = HD 120411c
13 50 06.27 -40 50 08.8 HIP 67522b = HD 120411b
----------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 47 131786 TESS light curve data of HIP 67522
fig3a.dat 111 880 MuSCAT4 g' transit data of HIP 67522
fig3b.dat 111 1104 MuSCAT4 i' transit data of HIP 67522
fig3c.dat 111 1202 MuSCAT4 r' transit data of HIP 67522
fig3d.dat 111 1688 MuSCAT4 zs transit data of HIP 67522
fig3e.dat 126 2463 Sinistro r' transit data of HIP 67522
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See also:
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)
J/ApJS/197/8 : Kepler's candidate multiple transiting planets (Lissauer+, 2011)
J/MNRAS/421/2342 : 4 Kepler systems transit timing obs. (Steffen+, 2012)
J/ApJ/784/45 : Kepler's multiple planet candidates. III. (Rowe+, 2014)
J/AJ/154/224 : Transiting planets in young clusters from K2 (Rizzuto+, 2017)
J/AJ/161/24 : TRICERATOPS predictions for 384 TOIs (Giacalone+, 2021)
J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021)
J/AJ/161/171 : THYME. V. Discovering a new stellar assoc. (Tofflemire+, 2021)
J/AJ/163/247 : HIRES, PEPSI & TRES radial veloc. of V1298 Tau (Johnson+, 2022)
J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)
J/A+A/664/A163 : TOI-1807 RV and flux curves (Nardiello+, 2022)
J/AJ/166/175 : Pre- and main sequence stars properties (Fernandes+, 2023)
J/A+A/677/A59 : SigMA clusters in Sco-Cen (Ratzenboeck+, 2023)
J/AJ/166/28 : Valid. of 69 exoplanets with ExoMiner V1.2 (Valizadegan+, 2023)
J/AJ/165/85 : THYME. IX. MELANGE-4 association members (Wood+, 2023)
J/AJ/167/55 : Multiple-planet system resonances (Hamer+, 2024)
J/AJ/168/41 : THYME. X. MELANGE-5 association cand. members (Thao+, 2024)
J/AJ/167/210 : <200Myr planet's hosts TESS parameters (Vach+, 2024)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1- 19 F19.14 d BJD Barycentric Julian Date - 2457000
21- 36 F16.14 --- Flux [0.96/1.05] Normalized flux
38- 43 F6.4 --- e_Flux [7e-4/2e-3] Uncertainty in Flux
45- 47 I3 s Cad [20/120] Data cadence
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Byte-by-byte Description of file: fig3a.dat fig3b.dat fig3c.dat fig3d.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian Date
16- 22 F7.5 --- Flux Normalized flux
24- 30 F7.5 --- e_Flux Uncertainty in Flux
32- 49 F18.16 --- Model Transit model
51- 73 E23.20 --- Residuals Model residuals
75- 92 F18.16 --- dFlux Detrended flux
94- 111 F18.16 --- dModel Detrended flux transit model
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Byte-by-byte Description of file: fig3e.dat
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Bytes Format Units Label Explanations
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1- 18 F18.10 d BJD Barycentric Julian Date
20- 37 F18.16 --- Flux Normalized flux
39- 45 F7.5 --- e_Flux Uncertainty in Flux
47- 64 F18.16 --- Model Transit model
66- 88 E23.20 --- Residuals Model residuals
90- 107 F18.16 --- dFlux Detrended flux
109- 126 F18.16 --- dModel Detrended flux transit model
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History:
From electronic version of the journal
References:
Barber et al. Pap II 2024ApJ...973L..30B 2024ApJ...973L..30B This catalog
Barber et al. Pap III 2025AJ....170...32B 2025AJ....170...32B Cat. J/AJ/170/32
Barber et al. Pap IV 2026AJ....171...20B 2026AJ....171...20B Cat. J/AJ/171/20
(End) Prepared by [AAS], Robin Leichtnam [CDS] 14-Apr-2026