Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable ...

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Draft version July 26, 2025
Typeset using L
A
TEX twocolumn style in AASTeX7
Worlds Next Door: A Candidate Giant Planet Im...

2 Beichman & Sanghi et al.
observations due to orbital motion. Incorporating constraints from the non-detections, we obtai...

JWST/MIRI Observations of ↵ Cen A: Paper I 3
Table 1. Stellar Properties
Property ↵ Cen A ↵ Cen B ✏ Mus References
Spectra...

4 Beichman & Sanghi et al.
10"
G0
G5
0.18 0.18 0.18 17.25 19.38 20.09 21.16 23.29 29.52 57.08 2913.18
10"
G9
0 3 9 20 43 8...

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JWST/MIRI Observations of ↵ Cen A: Paper I 5
N
E
August 2024
April 2025
February 2025
S1
KS5
Cen A
Cen B
KS2
5”
JWST/MIRI ...

6 Beichman & Sanghi et al.
Table 2. Observations of a Candidate Planet Orbiting ↵ Cen A
ID Epoch ( ↵, ) (⇢, ✓) Wavelength ...

JWST/MIRI Observations of ↵ Cen A: Paper I 7
N
E
Figure 3. PSF-subtracted image centered on ↵ Cen A
for the April 2025 obs...

8 Beichman & Sanghi et al.
N
E
N
E
Combined Minimum Combined Minimum Combined Minimum
Figure 5. Left: two-dimensional 5 pl...

JWST/MIRI Observations of ↵ Cen A: Paper I 9
N
E
N
E
N
E
52.6 mJy 17.8 mJy S/N = 21.3
Figure 6. Left: unconvolved asteroid...

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10 Beichman & Sanghi et al.
Table 3. Exozodiacal Disk Models
Mdust Mbelt Tcoll,1000km Fd,15 Fd,15/F?,15 Ld/L?
Model (10 8
...

JWST/MIRI Observations of ↵ Cen A: Paper I 11
April 25, 2025
February 20, 2025
S1
C1
1
3
N
E
Figure 8. 1 (solid) and 3 (do...

12 Beichman & Sanghi et al.
Table 4. Key S1 + C1 Orbital Parameters
Sightings Used Orbit Type a e imutual
a isky
b Teq
c
(...

JWST/MIRI Observations of ↵ Cen A: Paper I 13
Prograde < 2 au
a Prograde > 2 au
a
Retrograde < 2 au
a Retrograde > 2 au
a
...

14 Beichman & Sanghi et al.
1
RV Noise 2 3
Figure 11. The radial velocity (RV) semi-amplitude of a
100 M planet in stable ...

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JWST/MIRI Observations of ↵ Cen A: Paper I 15
Figure 12. Range of flux-averaged mean planet temper-
atures for AB = 0.3 co...

16 Beichman & Sanghi et al.
JWST S1 (F1550C)
VLT C1 (NEAR)
Synthetic Photometry (F1550C)
Synthetic Photometry (NEAR)
ATMO2...

JWST/MIRI Observations of ↵ Cen A: Paper I 17
2.0 0.2 au
± 1.4 0.3 au
±
209 11 K
± 257 22 K
±
(a)
(b)
(c)
(d)
Figure 14. R...

18 Beichman & Sanghi et al.
C1
S1
Figure 15. Blackbody (BB) emission from a circumplan-
etary ring for a total cross-secti...

JWST/MIRI Observations of ↵ Cen A: Paper I 19
20 30 40 50
Minimum imut (deg.)
0.00
0.05
0.10
0.15
0.20
Probability
Density...

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20 Beichman & Sanghi et al.
0.5 1.0 1.5 2.0 2.5 3.0
102
103
104
105
106
t
99
(yr)
ap = 1.69 au
ap = 2.09 au
ap = 1.63 au
a...

JWST/MIRI Observations of ↵ Cen A: Paper I 21
Table 5. Known S-type Planetary Systems with Similar Orbital Architecture as...

22 Beichman & Sanghi et al.
N
E
Telescope V3PA = 117.5
Figure 19. A prediction for the location of S1 based on the family ...

JWST/MIRI Observations of ↵ Cen A: Paper I 23
zodiacal” dust disk in the habitable zone of ↵ Cen A.
A limit of < 5–8⇥ the ...

24 Beichman & Sanghi et al.
pean Space Agency (ESA) mission Gaia (https://www.
cosmos.esa.int/gaia), processed by the Gaia...

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JWST/MIRI Observations of ↵ Cen A: Paper I 25
Table A1. Position of ↵ Cen A at JWST Observation Epochs
R.A. R.A.a Decl. De...

26 Beichman & Sanghi et al.
Table
A2.
Gaia
Astrometry
for
✏
Mus
and
O↵set
Stars
Star
Gaia
ID
R.A.
Decl.
µR.A.
µDecl.
Paral...

JWST/MIRI Observations of ↵ Cen A: Paper I 27
Table
A3.
Log
of
Successful
JWST/MIRI
Observations
of
↵
Cen
A
PID-Obs.
#
Tar...

28 Beichman & Sanghi et al.
Figure A2. Left: Orbit of ↵ Cen B relative to ↵ Cen A showing one epoch of Hipparcos and two e...

JWST/MIRI Observations of ↵ Cen A: Paper I 29
Thu 20 Feb 2025 Sun 11 Aug 2024
Fri 25 Apr 2025
0 50 100 150 200 250 300 350...

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30 Beichman & Sanghi et al.
Table B1. New ALMA Astrometry
Date Start Time Star R.A. Decl.
(UT hours)
01 June 2023 02:35 A ...

JWST/MIRI Observations of ↵ Cen A: Paper I 31
Table B2. Astrometry of ↵ Cen A and ↵ Cen B (2024–2027)
Julian Year Time R.A...

32 Beichman & Sanghi et al.
Butler R. P., Bedding T. R., Kjeldsen H., McCarthy C.,
O’Toole S. J., Tinney C. G., Marcy G. W...

JWST/MIRI Observations of ↵ Cen A: Paper I 33
Lacy, B. & Burrows, A. 2023, ApJ, Self-consistent Models
of Y Dwarf Atmosphe...

34 Beichman & Sanghi et al.
Quintana, E. V., Lissauer, J. J., Chambers, J. E., &
Duncan, M. 2002, ApJ, 576, 2. doi:10.1086...

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