TOI-561

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
TOI-561
TOI-561 b	0.45 d	1.4 R_⨁	Transit	2020	Lacedelli et al. 2021	Confirmed Planet
TOI-561 c	10.78 d	2.87 R_⨁	Transit	2020	Lacedelli et al. 2021	Confirmed Planet
TOI-561 f	16.29 d	2.32 R_⨁	Transit	2020	Weiss et al. 2021	False Positive Planet
TOI-561 d	25.71 d	2.62 R_⨁	Transit	2020	Lacedelli et al. 2021	Confirmed Planet
TOI-561 e	77.14 d	2.52 R_⨁	Transit	2020	Lacedelli et al. 2021	Confirmed Planet

Exoplanet Archive Notes (7)

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TOI-561 b

Planet also independently announced in this ref. (Weiss et al. 2021)

TOI-561 c

Planet also independently announced in this ref. (Weiss et al. 2021)

TOI-561 f

Conflicting planetary system architecture presented in ref. (Lacedelli et al. 2021)
Name of planet changed from TOI-561 d to TOI-561 f as TOI-561 d already exists in literature. (Weiss et al. 2021)
Confirmed planet signal refuted in ref. (Lacedelli et al. 2022)

TOI-561 d

Conflicting planetary system architecture presented in ref. (Weiss et al. 2021)

TOI-561 e

Conflicting planetary system architecture presented in ref. (Weiss et al. 2021)

TOI-561 Stellar Parameters (10 Solutions)

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RA: 09h52m44.44s

Dec: +06d12m57.97s

Distance: 85.7990+0.4988-0.4932
pc

Parallax: 11.6268000±0.0668703 mas

Ecliptic Latitude: -6.26469 deg

Ecliptic Longitude: 148.18985 deg

Galactic Latitude: 42.72934 deg

Galactic Longitude: 230.84909 deg

Total Proper Motion: 124.6638566±0.0898647 mas/yr

Proper Motion (RA): -108.4320000±0.0883905 mas/yr

Proper Motion (Dec): -61.5108000±0.0942989 mas/yr

Photometry: m_V
10.252±0.006; m_TESS
9.5273±0.0060; m_J
8.879±0.020; m_H
8.504±0.055; m_Ks
8.394±0.019; m_W1
8.337±0.023; m_W2
8.396±0.020; m_W3
8.375±0.023; m_W4
7.971±0.260; m_Gaia
10.012800±0.000278; m_B
10.965±0.082

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; TOI; Stellar Hosts

Source	Piotto et al. 2024	MacDougall et al. 2023	Lacedelli et al. 2022	Lacedelli et al. 2021	Weiss et al. 2021	TICv8	Gaia DR2	ExoFOP	ExoFOP	ExoFOP
T_eff (K)	---	5342+57-54	5372±70	5455+65-47	5326±64	5440.000+121.158-125.768	5353.0+102.7-266.5	5391±185	5391±185	5391±185
L_✶ (log₁₀(L_⦿))	---	-0.268+0.023-0.022	-0.273+0.023-0.024	---	-0.282+0.014-0.014	-0.2537555+0.0134580-0.0083158	-0.2471632+0.0032008-0.0032246	---	---	---
Metallicity (dex)	---	-0.303+0.058-0.056 [Fe/H]	-0.40±0.05 [Fe/H]	-0.33+0.10-0.05 [Fe/H]	-0.41±0.05 [Fe/H]	---	---	---	---	---
Age (Gyr)	---	16.1+2.4-3.1	11.0+2.8-3.5	>5	10±3	---	---	---	---	---
ρ_✶ (g/cm³)	1.85±0.07	1.6910+0.1062-0.0889	1.89±0.09	1.809±0.056	1.95±0.16	2.2550595+0.5466334-0.4373521	---	---	---	---
M_✶ (M_⦿)	0.806±0.036	0.7601+0.0245-0.0187	0.806±0.036	0.785±0.018	0.805±0.030	0.9500000+0.1231050-0.1115530	---	---	---	---
R_✶ (R_⦿)	0.843±0.005	0.8566+0.0143-0.0141	0.843±0.005	0.849±0.007	0.832±0.019	0.8405760+0.0497744-0.0406779	0.87473506+0.09406224-0.03261233	0.84±0.05	0.840575993061066±0.045226100000000	0.840575993061066±0.045226100000000
log g (log₁₀(cm/s²))	---	4.451+0.021-0.017	4.50±0.12	4.47±0.01	4.500±0.030	4.5666400+0.0872524-0.0667319	---	4.52526±0.28868	4.52526±0.28868	4.52526±0.28868
γ (km/s)	---	---	79.54±0.56	---	---	---	79.54096898189479±0.56459452584895	---	---	---
v sin i (km/s)	---	---	<2	<2	---	---	---	---	---	---
Sp. T	---	---	G9 V	G9 V	---	---	---	---	---	---
CAII LOG RHK	---	---	-5.003±0.012	---	---	---	---	---	---	---

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TOI-561 b Planetary Parameters (7 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit; Atmospheric Spectroscopy

Source	Piotto et al. 2024	Polanski et al. 2024	Brinkman et al. 2023	Lacedelli et al. 2022	Lacedelli et al. 2021	Weiss et al. 2021	ExoFOP
T_eq (K)	2319±34	2134.77115323496+31.27537841867-29.24623631889	---	2310±33	---	2480±200	2262
b	0.140+0.096-0.094	0.273198514355161+0.279423704047076-0.186390748168740	0.10±0.08	0.13+0.10-0.09	0.14+0.13-0.10	0.3±0.2	---
M_p (M_⨁)	2.02±0.23	3.00±0.45	2.24±0.20	2.00±0.23	1.59±0.36	3.2±0.8	---
M_p (M_Jup)	0.00636±0.00072	0.00944±0.00142	0.00705±0.00063	0.00629±0.00072	0.00500±0.00113	0.010±0.003	---
e	0	0	0	0	0	0	---
P (days)	0.4465697±0.0000003	0.44656895±0.00000078	0.4465688±0.0000008	0.4465688+0.0000007-0.0000008	0.446578±0.000017	0.446573+0.000032-0.000021	0.4465713±0.0000006
ρ (g/cm³)	4.1±0.5	5.30+1.20-1.51	4.8±0.5	3.8±0.5	3.0±0.8	5.5+2.0-1.6	---
R_p (R_⨁)	1.397±0.027	1.45661205691304+0.05259739076278-0.04565459049986	1.37±0.04	1.425±0.037	1.423±0.066	1.45±0.11	1.488670±0.100506
R_p (R_Jup)	0.1246±0.0024	0.129950447404467+0.004692432984810-0.004073036765944	0.122±0.004	0.1271±0.0033	0.1270±0.0059	0.129±0.010	0.1328105±0.0089666
R_p/R_✶	0.01519±0.00028	0.0155905959695805+0.0004987821515502-0.0004158524896028	0.01507±0.00043	0.0155±0.0004	0.0152±0.0007	0.016±0.001	---
K (m/s)	1.95±0.21	2.99±0.43	2.18±0.20	1.93±0.21	1.56±0.35	3.1±0.8	---
a (au)	0.01064±0.00016	0.0104±0.0002	0.0106±0.0004	0.0106±0.0001	0.01055±0.00008	0.01064±0.00013	---
T₁₄ (hours)	1.308±0.016	1.34928210698723+0.01991260086287-0.01884336506225	---	1.31±0.02	1.327+0.021-0.030	1.42±0.10	1.077±0.269
T_C (days)	2459317.75002±0.00041 (BJD-TDB)	2458517.94528±0.00072 (BJD)	2458517.4984±0.0019 (BJD)	2459317.7498±0.0005 (BJD)	2458517.498±0.001 (BJD)	2458517.4973±0.0018 (BJD)	2460285.4694590±0.0016031 (BJD)
S (S_⨁)	4709±153	---	---	4745±269	---	---	4347.38
δ (%)	---	---	---	---	---	---	0.02940000±0.00211432
a/R_✶	2.683±0.029	---	2.669±0.034	2.685+0.024-0.025	2.646±0.031	---	---
ω (deg)	0	90	0	90	90	---	---
i (deg)	87.0+2.0-2.1	---	87.9±1.8	87.2+1.9-2.1	87.0+2.1-2.8	---	---

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TOI-561 c Planetary Parameters (8 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit

Source	Piotto et al. 2024	Polanski et al. 2024	Brinkman et al. 2023	Kokori et al. 2023	Lacedelli et al. 2022	Lacedelli et al. 2021	Weiss et al. 2021	ExoFOP
T_eq (K)	802±12	738.680515299765+10.822009031175-10.119878631997	---	---	800±11	---	860±70	791
b	0.15+0.14-0.10	0.352814115182379+0.375745909942070-0.245048200637882	---	---	0.12+0.13-0.08	0.18+0.16-0.12	0.2±0.2	---
M_p (M_⨁)	5.93±0.67	6.9+1.3-1.2	6.60±0.73	---	5.39+0.69-0.68	5.40±0.98	7.0±2.3	---
M_p (M_Jup)	0.0187±0.0021	0.022+0.004-0.004	0.0208±0.0023	---	0.0170+0.0022-0.0021	0.0170±0.0031	0.022±0.007	---
e	0.023+0.034-0.017	0	---	0.0600+0.0670-0.0420	0.030+0.035-0.021	0.0600+0.0670-0.0420	0	---
P (days)	10.778838±0.000018	10.778849±0.000032	10.778831±0.000036	10.778829±0.000025	10.778831+0.000034-0.000036	10.779±0.004	10.77892±0.00015	10.7788330±0.0000289
ρ (g/cm³)	1.3±0.2	1.50+0.39-0.51	1.46±0.19	---	1.2±0.2	1.3±0.3	1.6±0.6	---
R_p (R_⨁)	2.865±0.041	2.92706746613992+0.20454033517451-0.09961404136471	2.91±0.04	---	2.91±0.04	2.878±0.096	2.90±0.13	2.658400±0.157545
R_p (R_Jup)	0.2556±0.0037	0.261135918107159+0.018247897881964-0.008886984823224	0.260±0.004	---	0.260±0.004	0.2568±0.0086	0.259±0.012	0.2371670±0.0140552
R_p/R_✶	0.03115±0.00041	0.0313293618734721+0.0021254832124154-0.0009332047339161	---	0.0308±0.0009	0.0316±0.0004	0.0308±0.0009	0.032±0.001	---
K (m/s)	1.98±0.21	2.41±0.42	2.22±0.23	---	1.81+0.23-0.22	1.84±0.33	2.4±0.8	---
a (au)	0.0889±0.0013	0.087±0.002	0.089±0.003	---	0.0884±0.0009	0.08809±0.00070	0.0888±0.0011	---
T₁₄ (hours)	3.739+0.053-0.101	3.827148867706871+0.160829141133305-0.111795248176332	---	---	3.75+0.05-0.08	3.77+0.07-0.15	4.04±0.26	3.416±0.347
T_C (days)	2459238.46284±0.00079 (BJD-TDB)	2458527.0606±0.0023 (BJD)	---	2459055.2229±0.0012 (BJD-TDB)	2459238.4629+0.0008-0.0009 (BJD)	2458527.060±0.004 (BJD)	2458527.05825±0.00053 (BJD)	2460273.2316240±0.0024724 (BJD)
a/R_✶	22.40±0.25	---	---	22.10±0.26	22.43+0.20-0.21	22.10±0.26	---	---
ω (deg)	219+87-149	90	---	200.0+55.0-49.0	291+55-84	200+55-49	---	---
i (deg)	89.61+0.27-0.33	---	---	89.53+0.32-0.39	89.69+0.21-0.31	89.53+0.32-0.39	---	---
S (S_⨁)	67.5±2.2	---	---	---	68.2±3.9	---	---	65.3136
δ (%)	---	---	---	---	---	---	---	0.11300000±0.00410743

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TOI-561 f Planetary Parameters (2 Solutions)

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Status: False Positive Planet

Detected By: Radial Velocity, Transit

Tools: Transit Prediction Service

Source	Weiss et al. 2021	ExoFOP
T_eq (K)	750±60	624.882080330294
b	0.1±0.1	---
M_p (M_⨁)	3.0+2.4-1.9	---
M_p (M_Jup)	0.0094+0.0076-0.0060	---
e	0	---
P (days)	16.287±0.005	16.3573852639539±0.0002003974200
ρ (g/cm³)	1.3+1.1-0.8	---
R_p (R_⨁)	2.32±0.16	2.15624235991267±0.41169757000000
R_p (R_Jup)	0.207±0.014	0.192367389829895±0.036729260315347
R_p/R_✶	0.0256±0.0016	---
K (m/s)	0.90±0.60	---
a (au)	0.1174±0.0015	---
T₁₄ (hours)	4.45±0.46	3.87104984295125±0.59653530000000
T_C (days)	2458521.8828±0.0035 (BJD)	2458521.85447100±0.00577777 (BJD)
S (S_⨁)	---	36.0340672119057
δ (%)	---	0.0503838443568009±0.0076634636000000

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TOI-561 d Planetary Parameters (6 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit

Source	Piotto et al. 2024	Polanski et al. 2024	Brinkman et al. 2023	Lacedelli et al. 2022	Lacedelli et al. 2021	ExoFOP
a/R_✶	40.00±0.44	---	---	40.04+0.36-0.37	39.35±0.46	---
b	0.36+0.13-0.19	0.282950669962731+0.296509815173869-0.198282670678943	---	0.45+0.11-0.17	0.32+0.17-0.19	---
ω (deg)	-131+17-26	90	---	235+14-26	246+67-124	---
M_p (M_⨁)	13.33±0.98	11.0±1.8	12.15±1.10	13.2+1.0-0.9	11.95±1.28	---
M_p (M_Jup)	0.04194±0.00308	0.0346±0.0057	0.03823±0.00346	0.0415+0.0031-0.0028	0.03760±0.00403	---
e	0.111+0.050-0.039	0	---	0.122+0.054-0.048	0.0510+0.0640-0.0360	---
i (deg)	89.51+0.25-0.14	---	---	89.40+0.21-0.11	89.54+0.28-0.21	---
P (days)	25.71268±0.00012	25.71255±0.00014	25.7124±0.0002	25.7124+0.0001-0.0002	25.62±0.04	25.7122157303±0.0022761028
ρ (g/cm³)	4.1±0.4	2.97+0.70-0.91	2.81±0.33	3.2±0.3	4.1±0.8	---
R_p (R_⨁)	2.615±0.059	2.72148317433192+0.11439871605580-0.09602033577234	2.82±0.07	2.82±0.07	2.53±0.13	2.87813920953189±1.14541140000000
R_p (R_Jup)	0.2333±0.0053	0.242794884492211+0.010205987423620-0.008566375332624	0.252±0.006	0.252±0.006	0.226±0.012	0.256770823910143±0.102186936587374
R_p/R_✶	0.02842±0.00063	0.0291289258575410+0.0011231112670458-0.0009090490436843	---	0.0306±0.0008	0.0271±0.0014	---
K (m/s)	3.36±0.22	2.86±0.45	3.04±0.25	3.34+0.23-0.22	3.06±0.33	---
a (au)	0.1587±0.0024	0.156±0.003	0.159±0.006	0.158±0.002	0.1569±0.0012	---
T₁₄ (hours)	4.73±0.29	5.19304863839825+0.16628343050314-0.11775245358205	---	4.54+0.32-0.29	4.85+0.20-0.35	5.97102278570611±1.51822970000000
T_C (days)	2459318.9711±0.0021 (BJD-TDB)	2458521.8815±0.0041 (BJD)	---	2459318.966+0.003-0.004 (BJD)	2458521.882±0.004 (BJD)	2458521.8998140±0.0177297 (BJD)
T_eq (K)	600±9	552.840410510876+8.099366106809-7.573880400094	---	598±9	---	331.787398412119
S (S_⨁)	21.2±0.7	---	---	21.4±1.3	---	2.86391780935147
δ (%)	---	---	---	---	---	0.115145473800456±0.012547072000000

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TOI-561 e Planetary Parameters (6 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit

Source	Piotto et al. 2024	Polanski et al. 2024	Brinkman et al. 2023	Lacedelli et al. 2022	Lacedelli et al. 2021	ExoFOP
a/R_✶	83.21±0.91	---	---	83.22+0.77-0.79	82.13±0.99	---
b	0.19+0.14-0.13	---	---	0.28+0.15-0.18	0.34+0.13-0.20	---
ω (deg)	148+26-39	90	---	143+42-44	155±83	---
M_p (M_⨁)	12.4±1.4	8.20+3.00-3.20	13.6±1.4	12.6±1.4	16.0±2.3	---
M_p (M_Jup)	0.0390±0.0044	0.0258+0.0094-0.0101	0.0428±0.0044	0.0396±0.0044	0.0503±0.0072	---
e	0.0740+0.0440-0.0390	0	---	0.0790+0.0580-0.0500	0.0610+0.0510-0.0420	---
i (deg)	89.864+0.095-0.094	---	---	89.80+0.13-0.10	89.75+0.14-0.08	---
P (days)	77.14400±0.00027	77.9±1.5	77.03±0.25	77.03+0.25-0.24	77.23±0.39	---
ρ (g/cm³)	4.3±0.5	---	4.91±0.74	4.2±0.8	4.6±0.9	---
R_p (R_⨁)	2.517±0.045	---	2.55±0.13	2.55+0.12-0.13	2.67±0.11	3.18580584003471±0.26661960000000
R_p (R_Jup)	0.2246±0.0040	---	0.227±0.012	0.227+0.011-0.012	0.238±0.010	0.284219049465819±0.023786248467713
R_p/R_✶	0.02736±0.00047	---	---	0.0278+0.0016-0.0014	0.0286±0.0011	---
K (m/s)	2.16±0.23	1.48±0.54	2.36±0.23	2.19±0.23	2.84±0.41	---
a (au)	0.3300±0.0050	0.327±0.008	0.33±0.01	0.328±0.003	0.3274+0.0028-0.0027	---
T₁₄ (hours)	7.138+0.137-0.240	---	---	6.98+0.24-0.40	6.96+0.34-0.38	6.6489215651662±0.7398640000000
T_C (days)	2458538.1803±0.0035 (BJD-TDB)	2458536.2±7.3 (BJD)	---	2458538.180+0.004-0.005 (BJD)	2458538.181±0.004 (BJD)	2458538.19764200±0.01383113 (BJD)
T_eq (K)	416±6	---	---	415±6	---	156.670146834968
S (S_⨁)	4.89±0.16	---	---	4.96±0.28	---	0.142385578329187
δ (%)	---	---	---	---	---	0.0914628173141767±0.0082487976000000

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Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 4 Confirmed Planets; 1 2MASS Point Source Catalog

Data Files: 4 Associated Literature Data

Bibliography (14 References)

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A Thick Volatile Atmosphere on the Ultrahot Super-Earth TOI-561 b
Teske et al. 2025 Reference Overview
Architecture of TOI-561 planetary system
Piotto et al. 2024 Reference Overview
The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets
Polanski et al. 2024 Reference Overview
The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars
MacDougall et al. 2023 Reference Overview
TOI-561 b: A Low-density Ultra-short-period "Rocky" Planet around a Metal-poor Star
Brinkman et al. 2023 Reference Overview
ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations
Kokori et al. 2023 Reference Overview
Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS
Lacedelli et al. 2022 Reference Overview
An unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561
Lacedelli et al. 2021 Reference Overview
The TESS-Keck Survey. II. An Ultra-short-period Rocky Planet and Its Siblings Transiting the Galactic Thick-disk Star TOI-561
Weiss et al. 2021 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
ExoFOP TOI Table
ExoFOP
All WISE Data Release
Cutri et al. 2014 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview

Legend

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System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
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Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/7/TOI-561.json

Catalog Parameters

RA

ra

09h52m44.44s

Dec

dec

+06d12m57.97s

β

elat

-6.26469

λ

elon

148.18985

b

glat

42.72934

l

glon

230.84909

m_V

sy_vmag

10.252±0.006

m_TESS

sy_tmag

9.5273±0.0060

m_J

sy_jmag

8.879±0.020

m_H

sy_hmag

8.504±0.055

m_Ks

sy_kmag

8.394±0.019

sy_kepmag

no_data

m_W1

sy_w1mag

8.337±0.023

m_W2

sy_w2mag

8.396±0.020

m_W3

sy_w3mag

8.375±0.023

m_W4

sy_w4mag

7.971±0.260

sy_icmag

no_data

m_Gaia

sy_gaiamag

10.012800±0.000278

m_B

sy_bmag

10.965±0.082

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

124.6638566±0.0898647

μ_δ

sy_pmdec

-61.5108000±0.0942989

μ_α

sy_pmra

-108.4320000±0.0883905

π

sy_plx

11.6268000±0.0668703

Distance

sy_dist

85.7990+0.4988-0.4932

Set Parameters

R_✶

st_rad

0.832±0.019

T_eff

st_teff

5326±64

TOI-561 Overview

TOI-561 Architecture & Discovery Information

TOI-561